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Note 2 - Acquisitions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 06, 2021 | Mar. 31, 2021 | Oct. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ (0) | $ 11,479 |  |  |  |  |  |  |
Cost of Revenue, Total |  |  |  | $ 23,364 | $ 23,227 | 69,533 | 69,925 |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 7,100 |  | $ 900 | $ 2,600 | $ 900 | $ 2,600 | $ 1,200 | $ 7,100 |  | $ 1,100 | $ 1,400 | $ 4,700 | $ 7,200
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Suppliers |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |
Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |
Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total | 16,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory |  |  |  |  |  |  |  | 600 |  |  |  |  |  |
Cost of Revenue, Total |  |  |  |  |  |  |  | 600 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  |  |  |  |  |  | 2,300 |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | $ 1,200 |  |  |  |  |  |  | 1,200 |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 24.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |
Neeltran Inc. [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 100 |  |  |  |  |  |  | 100 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 3,500 |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 26,000 | $ 26,000 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 873,657 | 873,657 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 42,400 | $ 42,400 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 1,700 | 1,700 |  |  |  |  |  | 1,700 |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Fair Value Adjustment to Inventory [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Revenue, Total |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  | 300 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Royalty Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  |  | 13.00% |  |  |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Trademarks and Trade Names [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Measurement Input (Rate) |  |  | 0.08% |  |  |  |  |  |  |  |  |  |  |
Northeast Power Systems, Inc (NEPSI) [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 600 | $ 600 |  |  |  |  |  | 600 |  |  |  |  |
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 | $ 6,100 |  |  |  |  |  | $ 6,100 |  |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 7,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Neeltran Third Party Lenders [Member] | Neeltran Inc. [Member] | Indebtedness Secured by Mortgage on Real Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 1,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Neeltran Inc. Sellling Stockholders [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 301,556 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Capanna, Sr. and Capanna, Jr. [Member] | Neeltran Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |
AMSC Husky LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | 4,300 |  |  |  |  |  |  |  |  |  |  |  |  |
AMSC Husky LLC [Member] | Owners of Neeltran Headquarters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |

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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 https://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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