Note H - Derivative Financial Instruments - Change in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)		3 Months Ended		6 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance at March 31, 2021		$ 62,942,275	$ 65,974,090	$ 65,339,976	$ 66,865,367
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total		4,227,185	0	(9,466,152)	0
Balance at September 30, 2021		80,335,001	$ 65,281,496	80,335,001	$ 65,281,496
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance at March 31, 2021				(11,187,841)
Other comprehensive loss, net of income, before reclassification				(15,178,284)
Total loss reclassified from AOCI (1)	[1]			5,712,132
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total				(9,466,152)
Balance at September 30, 2021		$ (20,653,993)		$ (20,653,993)

[1] The loss reclassified from AOCI is presented net of taxes of $3,015,588 which are included in provision for (benefit from) income taxes on the Company's Consolidated Statement of Operations for the three and six months ended September 30, 2021.