Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)	3 Months Ended						6 Months Ended	9 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 106,689,752	$ 102,715,030	$ 79,686,648	$ 80,335,001	$ 62,942,275	$ 65,339,976	$ 79,686,648	$ 79,686,648	$ 65,339,976
Net earnings	1,375,893	2,470,908	11,184,374	(2,961,833)	13,177,614	11,311,797		15,031,175	21,527,578
Other comprehensive income (loss)	669,454	1,578,033	7,174,117	13,795,418	4,227,185	(13,693,337)
Paid in capital – restricted stock awards	78,175	73,153	73,153	128,194	126,037	121,704
Repurchase of shares	(7,304)		(29,268)	(102,075)
Cash dividends	(147,512)	(147,372)	(157,694)	(138,024)	(138,110)	(137,865)
Net earnings	1,375,893	2,470,908	11,184,374	(2,961,833)	13,177,614	11,311,797		15,031,175	21,527,578
Issuance of restricted stock	0			0	0
Balance	108,658,458	106,689,752	102,715,030	91,056,681	80,335,001	62,942,275	106,689,752	108,658,458	91,056,681
Plateplus Inc. [Member]
Shares issued – Plateplus business combination			4,783,700				4,783,700	4,800,000
Common Stock [Member]
Balance	8,861,016	8,861,016	8,344,975	8,340,785	8,334,785	8,334,785	8,344,975	8,344,975	8,334,785
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)	0	0	0	0	0	0
Paid in capital – restricted stock awards	0	0	0	0	0	0
Repurchase of shares	0		0	0
Cash dividends	0	0	0	0	0	0
Net earnings	0	0	0	0	0	0
Issuance of restricted stock	7,700			4,190	6,000
Balance	8,868,716	8,861,016	8,861,016	8,344,975	8,340,785	8,334,785	8,861,016	8,868,716	8,344,975
Common Stock [Member] | Plateplus Inc. [Member]
Shares issued – Plateplus business combination			516,041
AOCI Attributable to Parent [Member]
Balance	(1,516,359)	(3,094,392)	(10,268,509)	(20,653,993)	(24,881,178)	(11,187,841)	(10,268,509)	(10,268,509)	(11,187,841)
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)	669,454	1,578,033	7,174,117	13,795,418	4,227,185	(13,693,337)
Paid in capital – restricted stock awards	0	0	0	0	0	0
Repurchase of shares	0		0	0
Cash dividends	0	0	0	0	0	0
Net earnings	0	0	0	0	0	0
Issuance of restricted stock	0			0	0
Balance	(846,905)	(1,516,359)	(3,094,392)	(6,858,575)	(20,653,993)	(24,881,178)	(1,516,359)	(846,905)	(6,858,575)
AOCI Attributable to Parent [Member] | Plateplus Inc. [Member]
Shares issued – Plateplus business combination			0
Additional Paid-in Capital [Member]
Balance	34,856,326	34,783,173	30,442,361	30,245,203	30,125,166	30,003,462	30,442,361	30,442,361	30,003,462
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)	0	0	0	0	0	0
Paid in capital – restricted stock awards	78,175	73,153	73,153	128,194	126,037	121,704
Repurchase of shares	0		0	0
Cash dividends	0	0	0	0	0	0
Net earnings	0	0	0	0	0	0
Issuance of restricted stock	(7,700)			(4,190)	(6,000)
Balance	34,926,801	34,856,326	34,783,173	30,369,207	30,245,203	30,125,166	34,856,326	34,926,801	30,369,207
Additional Paid-in Capital [Member] | Plateplus Inc. [Member]
Shares issued – Plateplus business combination			4,267,659
Treasury Stock [Member]
Balance	(7,770,465)	(7,770,465)	(7,741,197)	(7,203,342)	(7,203,342)	(7,203,342)	(7,741,197)	(7,741,197)	(7,203,342)
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)	0	0	0	0	0	0
Paid in capital – restricted stock awards	0	0	0	0	0	0
Repurchase of shares	(7,304)		(29,268)	(102,075)
Cash dividends	0	0	0	0	0	0
Net earnings	0	0	0	0	0	0
Issuance of restricted stock	0			0	0
Balance	(7,777,769)	(7,770,465)	(7,770,465)	(7,305,417)	(7,203,342)	(7,203,342)	(7,770,465)	(7,777,769)	(7,305,417)
Treasury Stock [Member] | Plateplus Inc. [Member]
Shares issued – Plateplus business combination			0
Retained Earnings [Member]
Balance	72,259,234	69,935,698	58,909,018	69,606,348	56,566,844	45,392,912	58,909,018	58,909,018	45,392,912
Net earnings	1,375,893	2,470,908	11,184,374	(2,961,833)	13,177,614	11,311,797
Other comprehensive income (loss)	0	0	0	0	0	0
Paid in capital – restricted stock awards	0	0	0	0	0	0
Repurchase of shares	0		0	0
Cash dividends	(147,512)	(147,372)	(157,694)	(138,024)	(138,110)	(137,865)
Net earnings	1,375,893	2,470,908	11,184,374	(2,961,833)	13,177,614	11,311,797
Issuance of restricted stock	0			0	0
Balance	$ 73,487,615	$ 72,259,234	69,935,698	$ 66,506,491	$ 69,606,348	$ 56,566,844	$ 72,259,234	$ 73,487,615	$ 66,506,491
Retained Earnings [Member] | Plateplus Inc. [Member]
Shares issued – Plateplus business combination			$ 0