Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Depreciation & Amortization	$ 137,429	$ (2,000)
Allowance For Doubtful Accounts	260,018	190,000
Stock Comp Expense	30,516	0
Gross deferred tax assets	1,431,550	1,448,000
Valuation allowance	(1,431,550)	(1,323,000)
Total deferred tax assets	0	125,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Federal Net operating loss carryovers	443,074	834,000
Federal R&D Credit	328,723	311,000
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]
Federal Net operating loss carryovers	105,699
Federal R&D Credit	$ 126,091	$ 115,000