Note D - Other Comprehensive (Loss) Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Balance	$ 85,455	$ 89,530	$ 88,772	$ 88,520
Balance	84,099	86,606	84,099	86,606
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(390)	(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	(5)	0
Net current period OCI/OCL	5	0	(5)	0
Balance	(385)	(444)	(385)	(444)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(104)	391	(110)	1,795
OCI/OCL before reclassifications	285	713	286	1,328
Amounts reclassified from OCI to Sales	(35)	(1,181)	54	(3,604)
Tax effect of OCI activity	(52)	122	(136)	526
Net current period OCI/OCL	198	(346)	204	(1,750)
Balance	94	45	94	45
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	252	488	407	348
OCI/OCL before reclassifications	(96)	(90)	(311)	88
Amounts reclassified from OCI to Sales	0	0	0	41
Tax effect of OCI activity	17	79	77	0
Net current period OCI/OCL	(79)	(11)	(234)	129
Balance	173	477	173	477
AOCI Attributable to Parent [Member]
Balance	(242)	435	(83)	1,699
OCI/OCL before reclassifications	189	623	(25)	1,416
Amounts reclassified from OCI to Sales	(35)	(1,181)	54	(3,563)
Tax effect of OCI activity	(30)	201	(64)	526
Net current period OCI/OCL	124	(357)	(35)	(1,621)
Balance	$ (118)	$ 78	$ (118)	$ 78