Note D - Other Comprehensive (Loss) Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 88,772	$ 88,520
Balance	88,815	89,856
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(380)	(444)
OCI/OCL before reclassifications	0	0
Amounts reclassified from OCI to Sales	0	0
Tax effect of OCI activity	(5)	0
Net current period OCI/OCL	(5)	0
Balance	(385)	(444)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(110)	1,795
OCI/OCL before reclassifications	670	1,788
Amounts reclassified from OCI to Sales	50	(1,262)
Tax effect of OCI activity	(218)	(118)
Net current period OCI/OCL	502	408
Balance	392	2,203
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	407	348
OCI/OCL before reclassifications	(91)	174
Amounts reclassified from OCI to Sales	0	0
Tax effect of OCI activity	30	(37)
Net current period OCI/OCL	(61)	137
Balance	346	485
AOCI Attributable to Parent [Member]
Balance	(83)	1,699
OCI/OCL before reclassifications	579	1,962
Amounts reclassified from OCI to Sales	50	(1,262)
Tax effect of OCI activity	(193)	(155)
Net current period OCI/OCL	436	545
Balance	$ 353	$ 2,244