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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Unbilled AR, beginning balance | $ 2,213 | $ 3,016
Deferred Program Costs, beginning balance | 318 | 2,567
Contract Liabilities, beginning balance | 15,519 | 21,937
Deferred Program Costs, increases for costs incurred to fulfill performance obligations | 2,153 | 1,267
Unbilled AR, increase (decrease) due to customer billings | (2,926) | (7,886)
Increase (decrease) due to customer billings | 19,340 | 7,828
Unbilled AR,Decrease due to cost recognition on completed performance obligations |  |
Deferred Program Costs, decrease due to cost recognition on completed performance obligations | (310) | (1,033)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations | 4,711 | 7,439
Deferred Program Costs, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  | (9)
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations | (18,534) | (8,296)
Unbilled AR, other changes and FX impact | (4) | (19)
Deferred Program Costs, other changes and FX impact | (9) | 24
Other changes and FX impact | (313) | (864)
Unbilled AR, impact of adoption of ASC 606 |  |
Deferred Program Costs, impact of adoption of ASC 606 |  | (1,599)
Contract Liabilities, impact of adoption of ASC 606 |  | (2,657)
Unbilled AR, ending balance | 3,994 | 2,550
Deferred Program Costs, ending balance | 2,152 | 1,217
Contract Liabilities, ending balance | $ 16,012 | $ 17,948

X
- Definition Represents the change in contract costs attributable to deferred program costs related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsChangeInContractCosts
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of contract costs recognized from deferred program costs, with regard to asset from contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsContractCostsRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the impact of the adoption of ASC 606 on deferred program costs related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsImpactOfAdoptionOfASC606
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net deferred program costs related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the change in the asset from contract with customer, attributable to other changes in deferred program costs. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsOtherChanges
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the change in the asset from contract with customer due to revenue recognized from deferred program costs. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsRevenueRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the revenue recognized from performance obligation satisfied from change in time frame of unbilled AR related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARChangeInTimeFramePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents decrease in the asset from the contract with customer from revenue recognized on unbilled accounts receivable due to cost recognition on completed performance obligations. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARDecreaseDueToCostRecognitionOnCompletedPerformanceObligation
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the impact of the adoption of ASC 606 on the unbilled AR during the period. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARImpactOfAdoptionOfASC606
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net unbilled AR related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents changes in the asset from contract with customer from other changes pertaining to unbilled accounts receivable. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledAROtherChanges
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the change in the asset from the contract with customer from revenue recognized on unbilled accounts receivable. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARRevenueRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the impact of the adoption of ASC 606 on the liability for contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerLiabilityImpactOfAdoptionOfASC606
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents other changes in the liability from contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerLiabilityOtherChanges
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration