Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Balance	$ 128,764	$ 129,687	$ 127,475	$ 126,809	$ 123,369	$ 115,432	$ 127,475	$ 115,432
Net earnings	(1,152)	(675)	2,567	1,184	3,513	7,690	740	12,387
Paid in capital – restricted stock units	32	42	47	37	78	78
Repurchase of shares	(37)	(11)	(123)	(5,148)	(3)
Cash dividends	(278)	(279)	(279)	(139)	(148)	(148)
Other comprehensive income						317
Balance	127,329	128,764	129,687	122,743	126,809	123,369	127,329	122,743
Common Stock [Member]
Balance	8,873	8,873	8,873	8,869	8,869	8,869	8,873	8,869
Net earnings	0	0	0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Repurchase of shares	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Other comprehensive income						0
Balance	8,873	8,873	8,873	8,869	8,869	8,869	8,873	8,869
AOCI Attributable to Parent [Member]
Balance	0	0	0	0	0	(317)	0	(317)
Net earnings	0	0	0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Repurchase of shares	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Other comprehensive income						317
Balance	0	0	0	0	0	0	0	0
Additional Paid-in Capital [Member]
Balance	35,336	35,294	35,247	35,161	35,083	35,005	35,247	35,005
Net earnings	0	0	0	0	0	0
Paid in capital – restricted stock units	32	42	47	37	78	78
Repurchase of shares	0	0	0	0	0
Cash dividends	0	0	0	0	0	0
Other comprehensive income						0
Balance	35,368	35,336	35,294	35,198	35,161	35,083	35,368	35,198
Treasury Stock, Common [Member]
Balance	(13,063)	(13,052)	(12,929)	(7,781)	(7,778)	(7,778)	(12,929)	(7,778)
Net earnings	0	0	0	0	0	0
Paid in capital – restricted stock units	0	0	0	0	0	0
Repurchase of shares	(37)	(11)	(123)	(5,148)	(3)
Cash dividends	0	0	0	0	0	0
Other comprehensive income						0
Balance	(13,100)	(13,063)	(13,052)	(12,929)	(7,781)	(7,778)	(13,100)	(12,929)
Retained Earnings [Member]
Balance	97,618	98,572	96,284	90,560	87,195	79,653	96,284	79,653
Net earnings	(1,152)	(675)	2,567	1,184	3,513	7,690
Paid in capital – restricted stock units	0	0	0	0	0	0
Repurchase of shares	0	0	0	0	0
Cash dividends	(278)	(279)	(279)	(139)	(148)	(148)
Other comprehensive income						0
Balance	$ 96,188	$ 97,618	$ 98,572	$ 91,605	$ 90,560	$ 87,195	$ 96,188	$ 91,605