Note 8 - Income Taxes - Reconciliation of Effective Income Tax Expense (Benefit) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Tax expense/(benefit) computed at U.S. statutory rates	$ 691,042	$ (697,040)
IRC Section 280E	132,063	173,045
Other permanent items	5,526	14,407
Change in valuation allowance	579,861	26,720
Adjustments to valuation of deferred tax assets	(1,408,492)	603,319
Tax return true-up	58,277	0
Total provision for income taxes	58,277	120,451
Penalties and interest on prior year tax liabilities	76,709	48,076
Total income tax expense	$ 134,986	$ 168,527