Note D - Other Comprehensive Income (Loss) - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 84,505	$ 71,131	$ 80,083	$ 71,375
Balance	84,401	72,488	84,401	72,488
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(538)	(888)	(538)	(888)
OCI/OCL before reclassifications	0	0	0	0
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	0	0	0	0
Net current period OCI/OCL	0	0	0	0
Balance	(538)	(888)	(538)	(888)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	931	(1,415)	(23)	(295)
OCI/OCL before reclassifications	855	(1,850)	2,244	(3,913)
Amounts reclassified from OCI to Sales	(504)	737	(650)	1,341
Tax effect of OCI activity	(82)	259	(371)	598
Net current period OCI/OCL	269	(854)	1,223	(1,974)
Balance	1,200	(2,269)	1,200	(2,269)
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	0		0
OCI/OCL before reclassifications	62		62
Amounts reclassified from OCI to Sales	0		0
Tax effect of OCI activity	0		0
Net current period OCI/OCL	62		62
Balance	62		62
AOCI Attributable to Parent [Member]
Balance	393	(2,303)	(561)	(1,183)
OCI/OCL before reclassifications	917	(1,850)	2,306	(3,913)
Amounts reclassified from OCI to Sales	(504)	737	(650)	1,341
Tax effect of OCI activity	(82)	259	(371)	598
Net current period OCI/OCL	331	(854)	1,285	(1,974)
Balance	$ 724	$ (3,157)	$ 724	$ (3,157)