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| | | <Role> http://www.amsc.com/20191231/role/statement-note-2-revenue-recognition-contract-assets-and-liabilities-details </Role> |
| | | <ShortName> Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 44 </Position> |
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| | | <LongName> 044 - Disclosure - Note 2 - Revenue Recognition - Revenues By Major Customers (Details) </LongName> |
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| | | <ShortName> Note 2 - Revenue Recognition - Revenues By Major Customers (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 45 </Position> |
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| | | <LongName> 045 - Disclosure - Note 3 - Stock-based Compensation (Details Textual) </LongName> |
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| | | <ShortName> Note 3 - Stock-based Compensation (Details Textual) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
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| | | <Position> 46 </Position> |
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| | | <LongName> 046 - Disclosure - Note 3 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> Note 3 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) </ShortName> |
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| | | <ShortName> Note 3 - Stock-based Compensation - Black Scholes Valuation (Details) </ShortName> |
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| | | <ShortName> Note 4 - Computation of Net Loss per Common Share (Details Textual) </ShortName> |
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| | | <ShortName> Note 5 - Goodwill (Details Textual) </ShortName> |
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| | | <ShortName> Note 6 - Fair Value Measurements (Details Textual) </ShortName> |
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| | | <LongName> 052 - Disclosure - Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) </ShortName> |
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| | | <LongName> 055 - Disclosure - Note 8 - Inventory (Details Textual) </LongName> |
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