Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Cash, Uninsured Amount	$ 412,000		$ 412,000		$ 754,000
Contract with Customer, Liability, Revenue Recognized	128,000	$ 120,000	212,000	$ 209,000
Advertising Expense	$ 5,908	$ 6,184	$ 17,041	$ 21,216
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			200,000	0
Earnings Per Share, Basic	$ (0)	$ 0	$ (0.01)	$ 0
Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years		5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years		7 years