Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Balance at March 31, 2021	$ 65,339,976	$ 66,865,367
Net earnings (loss)	11,311,797	(858,862)
Other comprehensive loss	(13,693,337)
Paid in capital – restricted stock awards	121,704	99,814
Cash dividends ($0.02 per share)	(137,865)	(143,229)
Balance at June 30, 2021	62,942,275	65,974,090
Issuance of restricted stock		11,000
Common Stock [Member]
Balance at March 31, 2021	8,334,785	8,295,160
Net earnings (loss)	0	0
Other comprehensive loss	0
Paid in capital – restricted stock awards	0	0
Cash dividends ($0.02 per share)	0	0
Balance at June 30, 2021	8,334,785	8,306,160
Issuance of restricted stock		11,000
AOCI Attributable to Parent [Member]
Balance at March 31, 2021	(11,187,841)	0
Net earnings (loss)	0	0
Other comprehensive loss	(13,693,337)
Paid in capital – restricted stock awards	0	0
Cash dividends ($0.02 per share)	0	0
Balance at June 30, 2021	(24,881,178)	0
Issuance of restricted stock		0
Additional Paid-in Capital [Member]
Balance at March 31, 2021	30,003,462	29,565,416
Net earnings (loss)	0	0
Other comprehensive loss	0
Paid in capital – restricted stock awards	121,704	99,814
Cash dividends ($0.02 per share)	0	0
Balance at June 30, 2021	30,125,166	29,665,230
Issuance of restricted stock		0
Treasury Stock [Member]
Balance at March 31, 2021	(7,203,342)	(5,525,964)
Net earnings (loss)	0	0
Other comprehensive loss	0
Paid in capital – restricted stock awards	0	0
Cash dividends ($0.02 per share)	0	0
Balance at June 30, 2021	(7,203,342)	(5,525,964)
Issuance of restricted stock		0
Retained Earnings [Member]
Balance at March 31, 2021	45,392,912	34,530,755
Net earnings (loss)	11,311,797	(858,862)
Other comprehensive loss	0
Paid in capital – restricted stock awards	0	0
Cash dividends ($0.02 per share)	(137,865)	(143,229)
Balance at June 30, 2021	$ 56,566,844	33,528,664
Issuance of restricted stock		$ 0