Note J - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 216,094	$ 559,967	$ 2,023,422	$ 889,855
Effective Income Tax Rate Reconciliation, Percent, Total			24.40%	49.10%