Note 9 - Concentrations (Details Textual)	12 Months Ended
Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022
Revenue	$ 2,965,406	$ 3,676,785
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Number of Customers		2
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk, Percentage	44.00%	40.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Foreign Customers [Member]
Concentration Risk, Percentage	11.00%	9.50%
Revenue	$ 312,706	$ 349,669
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Number of Customers	4		2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Two Customers [Member]
Concentration Risk, Percentage		75.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Four Customers [Member]
Concentration Risk, Percentage	89.00%

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details