Note 6 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement [Line Items]
Operating Lease, Expense	$ 86,000	$ 92,000
Letters of Credit Outstanding, Amount	0	0
Other Commitment	0	0
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 19,000	$ 22,000