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Note 10 - Governmental Assistance Programs (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Government Assistance, Amount $ 4,000 $ 0 $ 34,000 $ 207,000
Paycheck Protection Plan, CARES Act [Member]        
Debt Instrument, Decrease, Forgiveness     0 207,000
Employment Support Scheme [Member]        
Government Assistance, Amount $ 4,000 $ 0 $ 34,000 $ 0