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Note 2 - Acquisitions - Purchase Price (Details) - USD ($) $ in Thousands			3 Months Ended
	May 06, 2021	Oct. 01, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash or Debt payment			$ 11,479	$ (0)
Neeltran Inc. [Member]
Cash or Debt payment	$ 4,400
Total consideration	16,400
Neeltran Inc. [Member] \| Neeltran Inc. Sellling Stockholders [Member]
Cash or Debt payment	1,000
Issuance of 301,556 shares of Company's common stock	4,400
Neeltran Inc. [Member] \| Neeltran Third Party Lenders [Member]
Cash or Debt payment	$ 7,600
Northeast Power Systems, Inc (NEPSI) [Member]
Cash or Debt payment		$ 26,000
Issuance of 301,556 shares of Company's common stock		12,400
Total consideration		42,400
Contingent consideration		$ 4,000