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Note O - Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Pension Plan [Member]    
Service cost $ 792 $ 868
Interest cost 4,019 3,981
Expected return on plan assets (5,238) (6,041)
Amortization of transition obligation 34 36
Amortization of prior service cost 64 67
Amortization of actuarial net loss 2,710 3,021
Net periodic benefit cost 2,381 1,932
Other Postretirement Benefits Plan [Member]    
Service cost 18 20
Interest cost 304 325
Amortization of prior service cost (274) (206)
Amortization of actuarial net loss 32
Net periodic benefit cost $ 48 $ 171