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Note O - Pension and Other Postretirement Benefit Plans - Net Funded Status of Pension and Postretirement Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Net amount recognized $ 41,901 $ 30,877
Pension Plan [Member]    
Benefit obligation, beginning of year 105,012 118,170
Service cost 795 861
Interest cost 4,020 3,979
Actuarial loss (gain) 6,718 (8,690)
Contributions by plan participants 103 105
Benefits paid (9,326) (9,413)
Benefit obligation, end of year 107,322 105,012
Fair value of assets, Balance 90,258 94,372
Actual return on plan assets 4,125 2,894
Employer contribution 2,131 2,300
Contributions by plan participants 103 105
Benefits paid (9,326) (9,413)
Fair value of assets, Balance 87,291 90,258
Funded status (20,031) (14,754)
Other assets - noncurrent 3 157
Accrued liabilities - current (645) (679)
Accrued retirement benefits - noncurrent (19,389) (14,232)
Net amount recognized (20,031) (14,754)
Net transition obligation 178 204
Prior service cost 144 360
Actuarial net loss 42,185 31,146
Net amount recognized 42,507 31,710
Other Postretirement Benefits Plan [Member]    
Benefit obligation, beginning of year 8,077 11,574
Service cost 19 20
Interest cost 305 325
Actuarial loss (gain) 18 (2,608)
Contributions by plan participants 389 440
Benefits paid (1,357) (1,674)
Benefit obligation, end of year 7,451 8,077
Fair value of assets, Balance
Actual return on plan assets
Employer contribution 968 1,234
Contributions by plan participants 389 440
Benefits paid (1,357) (1,674)
Fair value of assets, Balance
Funded status (7,451) (8,077)
Other assets - noncurrent
Accrued liabilities - current (962) (1,241)
Accrued retirement benefits - noncurrent (6,489) (6,836)
Net amount recognized (7,451) (8,077)
Net transition obligation
Prior service cost (908)
Actuarial net loss 302 (833)
Net amount recognized $ (606) $ (833)