Note D - Other Comprehensive (Loss) Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 88,815	$ 89,856	$ 88,772	$ 88,520
Balance	85,455	89,530	85,455	89,530
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(385)	(444)	(380)	(444)
OCI/OCL before reclassifications	0	0	0	0
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	(5)	0	(10)	0
Net current period OCI/OCL	(5)	0	(10)	0
Balance	(390)	(444)	(390)	(444)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	392	2,203	(110)	1,795
OCI/OCL before reclassifications	(503)	(1,173)	167	615
Amounts reclassified from OCI to Sales	(127)	(1,162)	(77)	(2,423)
Tax effect of OCI activity	134	523	(84)	404
Net current period OCI/OCL	(496)	(1,812)	6	(1,404)
Balance	(104)	391	(104)	391
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	346	485	407	348
OCI/OCL before reclassifications	(125)	4	(215)	178
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	31	(1)	60	(38)
Net current period OCI/OCL	(94)	3	(155)	140
Balance	252	488	252	488
AOCI Attributable to Parent [Member]
Balance	353	2,244	(83)	1,699
OCI/OCL before reclassifications	(628)	(1,169)	(48)	793
Amounts reclassified from OCI to Sales	(127)	(1,162)	(77)	(2,423)
Tax effect of OCI activity	160	522	(34)	366
Net current period OCI/OCL	(595)	(1,809)	(159)	(1,264)
Balance	$ (242)	$ 435	$ (242)	$ 435