Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 126,809	$ 123,369	$ 115,432	$ 106,690	$ 102,715	$ 79,687	$ 115,432	$ 79,687
Net earnings	1,184	3,513	7,690	1,376	2,471	11,184	12,387	15,031
Other comprehensive income (loss)			317	669	1,578	7,174
Paid in capital – restricted stock units	37	78	78	78	73	73
Cash dividends	(139)	(148)	(148)	(148)	(147)	(158)
Repurchase of shares	(5,148)	(3)		(7)		(29)
Net earnings	1,184	3,513	7,690	1,376	2,471	11,184	12,387	15,031
Balance	122,743	126,809	123,369	108,658	106,690	102,715	122,743	108,658
Other comprehensive income (loss)			317	669	1,578	7,174
Issuance of restricted stock				0
Plateplus Inc. [Member]
Shares issued - Plateplus business combination						4,784		4,800
Common Stock [Member]
Balance	8,869	8,869	8,869	8,861	8,861	8,345	8,869	8,345
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)			0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Repurchase of shares	0	0		0		0
Net earnings	0	0	0	0	0	0
Balance	8,869	8,869	8,869	8,869	8,861	8,861	8,869	8,869
Other comprehensive income (loss)			0	0	0	0
Issuance of restricted stock				8
Common Stock [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination						516
AOCI Attributable to Parent [Member]
Balance	0	0	(317)	(1,516)	(3,094)	(10,268)	(317)	(10,268)
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)			317	669	1,578	7,174
Paid in capital – restricted stock units	0	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Repurchase of shares	0	0		0		0
Net earnings	0	0	0	0	0	0
Balance	0	0	0	(847)	(1,516)	(3,094)	0	(847)
Other comprehensive income (loss)			317	669	1,578	7,174
Issuance of restricted stock				0
AOCI Attributable to Parent [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination						0
Additional Paid-in Capital [Member]
Balance	35,161	35,083	35,005	34,856	34,783	30,442	35,005	30,442
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)			0	0	0	0
Paid in capital – restricted stock units	37	78	78	78	73	73
Cash dividends	0	0	0	0	0	0
Repurchase of shares	0	0		0		0
Net earnings	0	0	0	0	0	0
Balance	35,198	35,161	35,083	34,926	34,856	34,783	35,198	34,926
Other comprehensive income (loss)			0	0	0	0
Issuance of restricted stock				(8)
Additional Paid-in Capital [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination						4,268
Treasury Stock, Common [Member]
Balance	(7,781)	(7,778)	(7,778)	(7,770)	(7,770)	(7,741)	(7,778)	(7,741)
Net earnings	0	0	0	0	0	0
Other comprehensive income (loss)			0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Repurchase of shares	(5,148)	(3)		(7)		(29)
Net earnings	0	0	0	0	0	0
Balance	(12,929)	(7,781)	(7,778)	(7,777)	(7,770)	(7,770)	(12,929)	(7,777)
Other comprehensive income (loss)			0	0	0	0
Issuance of restricted stock				0
Treasury Stock, Common [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination						0
Retained Earnings [Member]
Balance	90,560	87,195	79,653	72,259	69,935	58,909	79,653	58,909
Net earnings	1,184	3,513	7,690	1,376	2,471	11,184
Other comprehensive income (loss)			0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Cash dividends	(139)	(148)	(148)	(148)	(147)	(158)
Repurchase of shares	0	0		0		0
Net earnings	1,184	3,513	7,690	1,376	2,471	11,184
Balance	$ 91,605	$ 90,560	87,195	73,487	72,259	69,935	$ 91,605	$ 73,487
Other comprehensive income (loss)			$ 0	0	$ 0	0
Issuance of restricted stock				$ 0
Retained Earnings [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination						$ 0