Note D - Other Comprehensive Income (Loss) - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Balance	$ 84,401	$ 72,488	$ 80,083	$ 71,375
Balance	85,077	76,024	85,077	76,024
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	1,200	(2,269)	(23)	(295)
OCI/OCL before reclassifications	1,064	1,639	3,308	(2,274)
Amounts reclassified from OCI to Sales	(685)	868	(1,335)	2,209
Tax effect of OCI activity	(120)	(582)	(491)	16
Net current period OCI/OCL	259	1,925	1,482	(49)
Balance	1,459	(344)	1,459	(344)
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	62	0	0	0
OCI/OCL before reclassifications	299	0	361	0
Amounts reclassified from OCI to Sales	0	0	0	0
Tax effect of OCI activity	(84)	0	(84)	0
Net current period OCI/OCL	215	0	277	0
Balance	277	0	277	0
AOCI Attributable to Parent [Member]
Balance	724	(3,157)	(561)	(1,183)
OCI/OCL before reclassifications	1,363	1,639	3,669	(2,274)
Amounts reclassified from OCI to Sales	(685)	868	(1,335)	2,209
Tax effect of OCI activity	(204)	(582)	(575)	16
Net current period OCI/OCL	474	1,925	1,759	(49)
Balance	$ 1,198	$ (1,232)	$ 1,198	$ (1,232)