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Note 2 - Acquisitions (Details Textual) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 06, 2021 | Oct. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2021 | Jun. 30, 2021
Payments to Acquire Businesses, Gross |  |  |  |  | $ 11,479,000 | $ 26,000,000 |  |  |  |
Cost of Revenue, Total |  |  | $ 23,227,000 | $ 19,676,000 | 69,925,000 | 51,444,000 |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 4,000.0 | 2,600 | $ 6,700 | $ 2,600 | $ 6,700 | $ 7,100 |  | $ 4,700 | $ 7,200
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |  |  |  |  |  |  |
Payments to Suppliers |  |  |  |  |  |  |  | $ 400,000 |  |
Backlog [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  | 2 years |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  | 7 years |  |  |  |  |
AMSC Husky LLC [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | $ 4,300,000 |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 4,400,000 |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total | 16,400,000 |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory |  |  |  |  | $ 600,000 |  |  |  |  |
Cost of Revenue, Total |  |  |  |  | 600,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 2,300,000 |  | $ 17,100,000 |  | 17,100,000 |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  | $ 1,200,000 |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | $ 1,200,000 |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 100.00% |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 2450.00% |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 1500.00% |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 100,000 |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 2 years |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 3,500,000 |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 7 years |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 26,000,000.0 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | 42,400,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | $ 1,700,000 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 873,657 |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares) |  | 1,000,000 | 1,000,000 |  | 1,000,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 14.23 |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 4,000,000.0 |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Fair Value Adjustment to Inventory [Member] |  |  |  |  |  |  |  |  |  |
Cost of Revenue, Total |  |  |  |  |  |  | 1,000,000.0 |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | $ 300,000 |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  | $ 600,000 |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  | 800.00% |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  | 1300.00% |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  | 800.00% |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 600,000 |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 2 years |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 6,100,000 |  |  |  |  |  |  |  |
Neeltran Inc. Sellling Stockholders [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,000,000.0 |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 301,556 |  |  |  |  |  |  |  |  |
Capanna, Sr. and Capanna, Jr. [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,100,000 |  |  |  |  |  |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 7,600,000 |  |  |  |  |  |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] | Indebtedness Secured by Mortgage on Real Property [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 1,900,000 |  |  |  |  |  |  |  |  |
Owners of Neeltran Headquarters [Member] | AMSC Husky LLC [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | 2,400,000 |  |  |  |  |  |  |  |  |
TD Bank [Member] | AMSC Husky LLC [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | $ 1,900,000 |  |  |  |  |  |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=SL65897772-128472 + Details
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