Note D - Other Comprehensive (Loss) Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 89,530	$ 84,401	$ 88,520	$ 80,083
Balance	86,606	85,077	86,606	85,077
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(444)	(538)	(444)	(538)
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	(444)	(538)	(444)	(538)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	391	1,200	1,795	(23)
OCI/OCL before reclassifications	713	1,064	1,328	3,308
Amounts reclassified from OCI to Sales	(1,181)	(685)	(3,604)	(1,335)
Tax effect of OCI activity	122	(120)	526	(491)
Net current period OCI/OCL	(346)	259	(1,750)	1,482
Balance	45	1,459	45	1,459
Accumulated Gain (Loss), Net, Swap Derivative, Parent [Member]
Balance	488	62	348	0
OCI/OCL before reclassifications	(90)	299	88	361
Amounts reclassified from OCI to Sales	0	0	41	0
Tax effect of OCI activity	79	(84)	0	(84)
Net current period OCI/OCL	(11)	215	129	277
Balance	477	277	477	277
AOCI Attributable to Parent [Member]
Balance	435	724	1,699	(561)
OCI/OCL before reclassifications	623	1,363	1,416	3,669
Amounts reclassified from OCI to Sales	(1,181)	(685)	(3,563)	(1,335)
Tax effect of OCI activity	201	(204)	526	(575)
Net current period OCI/OCL	(357)	474	(1,621)	1,759
Balance	$ 78	$ 1,198	$ 78	$ 1,198