Note 10 - Governmental Assistance Programs (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Government Assistance, Amount	$ 8,000	$ 207,000	$ 30,000	$ 207,000
Paycheck Protection Plan, CARES Act [Member]
Debt Instrument, Decrease, Forgiveness	0	207,000	0	207,000
Employment Support Scheme [Member]
Government Assistance, Amount	$ 8,000	$ 0	$ 30,000	$ 0