Note D - Other Comprehensive Loss - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Balance	$ 79,141	$ 85,455	$ 82,595	$ 88,772
Balance	76,619	84,099	76,619	84,099
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(286)	(390)	(278)	(380)
OCI/OCL before reclassifications	0	0	0	0
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	1	5	(7)	(5)
Net current period OCI/OCL	1	5	(7)	(5)
Balance	(285)	(385)	(285)	(385)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	438	(104)	172	(110)
OCI/OCL before reclassifications	(433)	285	(57)	286
Amounts reclassified from OCI to Sales	(91)	(35)	(138)	54
Tax effect of OCI activity	110	(52)	47	(136)
Net current period OCI/OCL	(414)	198	(148)	204
Balance	24	94	24	94
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	0	252	84	407
OCI/OCL before reclassifications	0	(96)	(111)	(311)
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	0	17	27	77
Net current period OCI/OCL	0	(79)	(84)	(234)
Balance	0	173	0	173
AOCI Attributable to Parent [Member]
Balance	152	(242)	(22)	(83)
OCI/OCL before reclassifications	(433)	189	(168)	(25)
Amounts reclassified from OCI to Sales	(91)	(35)	(138)	54
Tax effect of OCI activity	111	(30)	67	(64)
Net current period OCI/OCL	(413)	124	(239)	(35)
Balance	$ (261)	$ (118)	$ (261)	$ (118)