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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Income Tax Expense (Benefit), Total $ 32 $ (2,128)
Liability for Uncertainty in Income Taxes, Current 0  
Unrecognized Tax Benefits, Ending Balance 0  
Neeltran Inc. [Member]    
Deferred Tax Liabilities, Other Finite-Lived Assets 2,300  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (2,300)  
Maximum [Member]    
Income Tax Expense (Benefit), Total $ 100