Note J - Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Balance	$ 182,818	$ 143,616
Release stranded tax effects
Balance	139,958	182,818
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	4,439	7,085
Other comprehensive loss before reclassifications	(985)	(2,646)
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive loss	(985)	(2,646)
Release stranded tax effects
Balance	3,454	4,439
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(41,901)	(30,877)
Other comprehensive loss before reclassifications	(3,792)	(6,068)
Amounts reclassified from accumulated other comprehensive loss	2,117	1,947
Net current period other comprehensive loss	(1,675)	(11,024)
Release stranded tax effects		(6,903)
Balance	(43,576)	(41,901)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(509)
Other comprehensive loss before reclassifications	(595)	(509)
Amounts reclassified from accumulated other comprehensive loss
Net current period other comprehensive loss	(595)	(509)
Release stranded tax effects
Balance	$ (1,104)	$ (509)