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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Income Tax Expense (Benefit), Total $ 1 $ (1,546) $ (1,946) $ (1,166)
Liability for Uncertainty in Income Taxes, Current 0   0  
Unrecognized Tax Benefits, Ending Balance 0   0  
Neeltran Inc. [Member]        
Deferred Tax Liabilities, Other Finite-Lived Assets 2,300   2,300  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (2,300)  
Northeast Power Systems, Inc (NEPSI) [Member]        
Deferred Tax Liabilities, Other Finite-Lived Assets $ 1,700   $ 1,700  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 1,700   $ 1,700