Note E - Other Comprehensive Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Balance	$ 88,520	$ 80,083
Balance	88,772	88,520
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(444)	(538)
OCI/OCL before reclassifications	8	17
Amounts reclassified from OCI	78	113
Tax effect of OCI activity	(22)	(36)
Net current period OCI/OCL	64	94
Balance	(380)	(444)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	1,795	(23)
OCI/OCL before reclassifications	538	5,370
Amounts reclassified from OCI	(3,086)	(3,011)
Tax effect of OCI activity	643	(541)
Net current period OCI/OCL	(1,905)	1,818
Balance	(110)	1,795
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	348	0
OCI/OCL before reclassifications	79	454
Amounts reclassified from OCI	0	0
Tax effect of OCI activity	(20)	(106)
Net current period OCI/OCL	59	348
Balance	407	348
AOCI Attributable to Parent [Member]
Balance	1,699	(561)
OCI/OCL before reclassifications	625	5,841
Amounts reclassified from OCI	(3,008)	(2,898)
Tax effect of OCI activity	601	(683)
Net current period OCI/OCL	(1,782)	2,260
Balance	$ (83)	$ 1,699