Note N - Supplemental Cash Flow Information (Details Textual) - USD ($)	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 96,000	$ 12,000
Income Taxes Paid	5,645,000	$ 10,000
Capital Expenditures Incurred but Not yet Paid	$ 3,234,068