Note 5 - Line of Credit and Long-term Debt - Summary of Line of Credit and Long-term Debt (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022
Less current maturities	$ (386,000)	$ (490,000)
Long-term debt, excluding current maturities	4,378,000	4,448,000
Less unamortized debt issuance costs	(105,000)	(112,000)
Total long-term debt, net of current maturities and unamortized debt issuance costs	4,273,000	4,336,000
Long-term Debt, Excluding Related Party Debt [Member]
Long-term debt	3,764,000	3,938,000
Debt - related party	3,764,000	3,938,000
Unsecured Subordinated Loan [Member]
Long-term debt	1,000,000	1,000,000
Debt - related party	$ 1,000,000	$ 1,000,000