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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Tax Expense (Benefit), Total $ (14) $ 181 $ 18 $ (1,947)
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)
Maximum [Member]        
Income Tax Expense (Benefit), Total $ (100)   $ 100