Note H - Derivative Financial Instruments - Change in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)		3 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Balance at March 31, 2021		$ 65,339,976	$ 66,865,367
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total		(13,693,337)	0
Balance at June 30, 2021		62,942,275	$ 65,974,090
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		(16,359,735)
Total loss reclassified from AOCI (1)	[1]	2,666,398
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total		(13,693,337)
Balance at June 30, 2021		$ (24,881,178)

[1] The loss reclassified from AOCI is presented net of taxes of $849,422 which are included in provision for (benefit from) income taxes on the Company's Consolidated Statement of Operations for the three months ended June 30, 2021.