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Note I - Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Balance $ 139,958 $ 182,818
Balance 130,660 139,958
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance 3,454 4,439
Other comprehensive loss before reclassifications 5,738 (985)
Amounts reclassified from accumulated other comprehensive loss 0 0
Net current period other comprehensive income 5,738 (985)
Balance 9,192 3,454
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]    
Balance (43,576) (41,901)
Other comprehensive loss before reclassifications 9,783 (3,792)
Amounts reclassified from accumulated other comprehensive loss 2,330 2,117
Net current period other comprehensive income 12,113 (1,675)
Balance (31,463) (43,576)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance (1,104) (509)
Other comprehensive loss before reclassifications 426 (595)
Amounts reclassified from accumulated other comprehensive loss 0 0
Net current period other comprehensive income 426 (595)
Balance (678) (1,104)
Accumulated Gain (Loss), Net, Net Investment Hedge [Member]    
Balance 0  
Other comprehensive loss before reclassifications 334  
Amounts reclassified from accumulated other comprehensive loss 0  
Net current period other comprehensive income 334  
Balance $ 334 $ 0