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Note 7 - Accounts Receivable (Tables) | 9 Months Ended
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Dec. 31, 2019
Notes Tables |
Accounts Receivable [Table Text Block] |
|  | December 31, 2019 |  |  | March 31, 2019 |
Accounts receivable (billed) |  | $ | 11,878 |  |  | $ | 5,642 |
Accounts receivable (unbilled) |  |  | 4,613 |  |  |  | 2,213 |
Accounts receivable, net |  | $ | 16,491 |  |  | $ | 7,855 |

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- Definition Tabular disclosure of accounts receivable. + References No definition available. + Details
Name: | amsc_AccountsReceivableTableTextBlock
Namespace Prefix: | amsc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration