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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 037 - Disclosure - Note 9 - Income Taxes (Details Textual) </link:definition> |
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| | </xsd:annotation> |
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| <xsd:element abstract="true" id="pke_AdditionalManufacturingFacilityMember" name="AdditionalManufacturingFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_ConstructionInProgressEstimatedCost" name="ConstructionInProgressEstimatedCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_DirectorsAndCertainOfEmployeesMember" name="DirectorsAndCertainOfEmployeesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_GainsOnMarketableSecuritiesMember" name="GainsOnMarketableSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_GeographicRegionsTextBlock" name="GeographicRegionsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_IncomeTaxExpenseBenefitDiscreteAmount" name="IncomeTaxExpenseBenefitDiscreteAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_LeaseAgreementWithCityAndCountyForLandAtNewtonKansasAirportMember" name="LeaseAgreementWithCityAndCountyForLandAtNewtonKansasAirportMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_LeasesWithRenewalOptionsMember" name="LeasesWithRenewalOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_LossesOnMarketableSecuritiesMember" name="LossesOnMarketableSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_NumberOfInsuranceCarriers" name="NumberOfInsuranceCarriers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_NumberOfUnitsCoveredUnderGeneralLiabilityInsuranceCoverage" name="NumberOfUnitsCoveredUnderGeneralLiabilityInsuranceCoverage" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_PercentageOfLegalDefenseAndRemediationCostsAssociatedWithSitesReimbursedByInsuranceCarriers" name="PercentageOfLegalDefenseAndRemediationCostsAssociatedWithSitesReimbursedByInsuranceCarriers" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_PercentageOfStockOptionsExercisableOnEachSucceedingYearFromDateOfGrant" name="PercentageOfStockOptionsExercisableOnEachSucceedingYearFromDateOfGrant" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_PercentageOfStockOptionsExercisableOneYearFromDateOfGrant" name="PercentageOfStockOptionsExercisableOneYearFromDateOfGrant" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_ScheduleOfRightofuseAssetsAndOperatingLeaseLiabilitiesTableTextBlock" name="ScheduleOfRightofuseAssetsAndOperatingLeaseLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_SpecialDividendMember" name="SpecialDividendMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="pke_StockRepurchaseProgramPercentageOfOutstandingSharesAuthorizedToBeRepurchased" name="StockRepurchaseProgramPercentageOfOutstandingSharesAuthorizedToBeRepurchased" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/> |
| <xsd:element id="pke_StockoldersEquityIncludingTreasuryStock" name="StockoldersEquityIncludingTreasuryStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="pke_The2018StockOptionPlanMember" name="The2018StockOptionPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-10-geographic-regions-financial-information-by-geographic-region-details" name="statement-statement-note-10-geographic-regions-financial-information-by-geographic-region-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-10-geographic-regions-tables" name="statement-statement-note-10-geographic-regions-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-3-marketable-securities-estimated-fair-value-of-securities-by-contractual-maturity-details" name="statement-statement-note-3-marketable-securities-estimated-fair-value-of-securities-by-contractual-maturity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-3-marketable-securities-summary-of-availableforsale-securities-details" name="statement-statement-note-3-marketable-securities-summary-of-availableforsale-securities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-3-marketable-securities-summary-of-availableforsale-securities-detailsD244909D-F10A-470C-BF39-E22D59A335E0" name="statement-statement-note-3-marketable-securities-summary-of-availableforsale-securities-detailsD244909D-F10A-470C-BF39-E22D59A335E0" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-3-marketable-securities-summary-of-unrealized-gains-and-losses-on-availableforsale-securities-details" name="statement-statement-note-3-marketable-securities-summary-of-unrealized-gains-and-losses-on-availableforsale-securities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-3-marketable-securities-tables" name="statement-statement-note-3-marketable-securities-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-4-inventories-summary-of-inventories-details" name="statement-statement-note-4-inventories-summary-of-inventories-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-4-inventories-tables" name="statement-statement-note-4-inventories-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-5-leases-future-minimum-lease-payments-details" name="statement-statement-note-5-leases-future-minimum-lease-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-5-leases-schedule-of-rightofuse-assets-and-operating-lease-liabilties-details" name="statement-statement-note-5-leases-schedule-of-rightofuse-assets-and-operating-lease-liabilties-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-5-leases-tables" name="statement-statement-note-5-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-6-stockbased-compensation-option-activity-details" name="statement-statement-note-6-stockbased-compensation-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-6-stockbased-compensation-tables" name="statement-statement-note-6-stockbased-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-7-earnings-per-share-basic-and-diluted-earnings-per-share-details" name="statement-statement-note-7-earnings-per-share-basic-and-diluted-earnings-per-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="pke_statement-statement-note-7-earnings-per-share-tables" name="statement-statement-note-7-earnings-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| </xsd:schema> |