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Note O - Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Net Funded Status [Table Text Block] |
|  | Pension |  |  | Other Postretirement |
|  | Benefits |  |  | Benefits |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 105,012 |  |  | $ | 118,170 |  |  | $ | 8,077 |  |  | $ | 11,574 |
Service cost |  |  | 795 |  |  |  | 861 |  |  |  | 19 |  |  |  | 20 |
Interest cost |  |  | 4,020 |  |  |  | 3,979 |  |  |  | 305 |  |  |  | 325 |
Actuarial loss (gain) |  |  | 6,718 |  |  |  | (8,690 | ) |  |  | 18 |  |  |  | (2,608 | )
Contributions by plan participants |  |  | 103 |  |  |  | 105 |  |  |  | 389 |  |  |  | 440 |
Benefits paid |  |  | (9,326 | ) |  |  | (9,413 | ) |  |  | (1,357 | ) |  |  | (1,674 | )
Benefit obligation, end of year |  | $ | 107,322 |  |  | $ | 105,012 |  |  | $ | 7,451 |  |  | $ | 8,077 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of assets, beginning of year |  | $ | 90,258 |  |  | $ | 94,372 |  |  | $ | - |  |  | $ | - |
Actual return on plan assets |  |  | 4,125 |  |  |  | 2,894 |  |  |  | - |  |  |  | - |
Employer contribution |  |  | 2,131 |  |  |  | 2,300 |  |  |  | 968 |  |  |  | 1,234 |
Contributions by plan participants |  |  | 103 |  |  |  | 105 |  |  |  | 389 |  |  |  | 440 |
Benefits paid |  |  | (9,326 | ) |  |  | (9,413 | ) |  |  | (1,357 | ) |  |  | (1,674 | )
Fair value of assets, end of year |  | $ | 87,291 |  |  | $ | 90,258 |  |  | $ | - |  |  | $ | - |
Funded status |  | $ | (20,031 | ) |  | $ | (14,754 | ) |  | $ | (7,451 | ) |  | $ | (8,077 | )
Amounts recognized in the balance sheet consist of: |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets - noncurrent |  | $ | 3 |  |  | $ | 157 |  |  | $ | - |  |  | $ | - |
Accrued liabilities - current |  |  | (645 | ) |  |  | (679 | ) |  |  | (962 | ) |  |  | (1,241 | )
Accrued retirement benefits - noncurrent |  |  | (19,389 | ) |  |  | (14,232 | ) |  |  | (6,489 | ) |  |  | (6,836 | )
Net amount recognized |  | $ | (20,031 | ) |  | $ | (14,754 | ) |  | $ | (7,451 | ) |  | $ | (8,077 | )
Amounts recognized in accumulated other comprehensive loss consist of (net of tax): |  |  |  |  |  |  |  |  |
Net transition obligation |  | $ | 178 |  |  | $ | 204 |  |  | $ | - |  |  | $ | - |
Prior service cost |  |  | 144 |  |  |  | 360 |  |  |  | (908 | ) |  |  | - |
Actuarial net loss |  |  | 42,185 |  |  |  | 31,146 |  |  |  | 302 |  |  |  | (833 | )
Net amount recognized |  | $ | 42,507 |  |  | $ | 31,710 |  |  | $ | (606 | ) |  | $ | (833 | )
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  |  |  |  |  | Other |
|  | Pension |  |  | Postretirement |
|  | Benefits |  |  | Benefits |
Net transition obligation |  | $ | 34 |  |  | $ | - |
Prior service cost |  |  | 45 |  |  |  | (275 | )
Actuarial net loss |  |  | 3,134 |  |  |  | - |
Net amount to be recognized |  | $ | 3,213 |  |  | $ | (275 | )
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] |
|  | June 30 |
|  | 2019 |  |  | 2018 |
Projected and accumulated benefit obligation |  | $ | 102,879 |  |  | $ | 100,699 |
Fair value of plan assets |  |  | 82,845 |  |  |  | 85,788 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Benefits |
|  | 2019 |  |  | 2018 |
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 |
|  | 2019 |  |  | 2018 |
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 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Other |
|  |  |  |  |  | Postretirement |
|  | Pension |  |  | Benefits |
Net loss |  | $ | 8,098 |  |  | $ | 18 |
Prior service cost |  |  | (211 | ) |  |  | - |
Amortization of transition asset |  |  | (34 | ) |  |  | - |
Amortization of prior service (cost) benefit |  |  | (64 | ) |  |  | 275 |
Amortization of net (loss) gain |  |  | (2,711 | ) |  |  | - |
Total recognized in other comprehensive income |  |  | 5,078 |  |  |  | 293 |
Net periodic benefit cost |  |  | 2,381 |  |  |  | 48 |
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 7,459 |  |  | $ | 341 |
|  |  |  |  |  | Other |
|  |  |  |  |  | Postretirement |
|  | Pension |  |  | Benefits |
Net gain |  | $ | (5,643 | ) |  | $ | (940 | )
Prior service cost |  |  | - |  |  |  | (1,668 | )
Amortization of transition asset |  |  | (34 | ) |  |  | - |
Amortization of prior service (cost) benefit |  |  | (67 | ) |  |  | 206 |
Amortization of net (loss) gain |  |  | (2,952 | ) |  |  | (32 | )
Total recognized in other comprehensive income |  |  | (8,696 | ) |  |  | (2,434 | )
Net periodic benefit cost |  |  | 1,932 |  |  |  | 171 |
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | (6,764 | ) |  | $ | (2,263 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Other |
|  | Pension Benefits |  |  | Postretirement Benefits |
Weighted average assumptions used to determine benefit obligations at June 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Discount rate |  |  | 3.22 | % |  |  | 4.01 | % |  |  | 3.15 | % |  |  | 4.09 | %
Expected return on plan assets |  |  | 6.04 | % |  |  | 6.74 | % |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Other |
|  | Pension Benefits |  |  | Postretirement Benefits |
Weighted average assumptions used to determine net periodic benefit costs for years ended June 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Discount rate |  |  | 4.01 | % |  |  | 3.51 | % |  |  | 4.09 | % |  |  | 3.41 | %
Expected return on plan assets |  |  | 6.74 | % |  |  | 6.68 | % |  |  |  |  |  |  |  |
Schedule of Plan Weighted Average Assets Allocations [Table Text Block] |
|  | Target |  |  | June 30 |
Asset Category |  | Allocation |  |  | 2019 |  |  | 2018 |
Equity securities |  |  | 51 | % |  |  | 49 | % |  |  | 51 | %
Debt securities |  |  | 40 | % |  |  | 42 | % |  |  | 39 | %
Real estate |  |  | 9 | % |  |  | 9 | % |  |  | 10 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Total |  |  | Level I |  |  | Level II |  |  | Level III |
Cash and cash equivalents |  | $ | 971 |  |  | $ | 971 |  |  | $ | - |  |  | $ | - |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company common stock (a) |  |  | 1,483 |  |  |  | 1,483 |  |  |  | - |  |  |  | - |
Common stock (a) |  |  | 16,713 |  |  |  | 16,713 |  |  |  | - |  |  |  | - |
Mutual funds (b) |  |  | 7,963 |  |  |  | 7,963 |  |  |  | - |  |  |  | - |
Annuity contracts (c) |  |  | 6,171 |  |  |  | - |  |  |  | - |  |  |  | 6,171 |
Total |  | $ | 33,301 |  |  | $ | 27,130 |  |  | $ | - |  |  | $ | 6,171 |
Investments Measured at Net Asset Value (d) |  |  | 53,990 |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ | 87,291 |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Total |  |  | Level I |  |  | Level II |  |  | Level III |
Cash and cash equivalents |  | $ | 1,156 |  |  | $ | 1,156 |  |  | $ | - |  |  | $ | - |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company common stock (a) |  |  | 2,438 |  |  |  | 2,438 |  |  |  | - |  |  |  | - |
Common stock (a) |  |  | 17,373 |  |  |  | 17,373 |  |  |  | - |  |  |  | - |
Mutual funds (b) |  |  | 8,554 |  |  |  | 8,554 |  |  |  | - |  |  |  | - |
Annuity contracts (c) |  |  | 6,113 |  |  |  | - |  |  |  | - |  |  |  | 6,113 |
Total |  | $ | 35,634 |  |  | $ | 29,521 |  |  | $ | - |  |  | $ | 6,113 |
Investments Measured at Net Asset Value (d) |  |  | 54,624 |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ | 90,258 |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2018 |
Fixed income funds |  | $ | 33,568 |  |  | $ | 31,852 |
International equity securities |  |  | 3,168 |  |  |  | 3,294 |
Real estate |  |  | 7,069 |  |  |  | 8,218 |
Hedged equity mutual funds |  |  | 10,185 |  |  |  | 11,260 |
Total |  | $ | 53,990 |  |  | $ | 54,624 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
|  | 2019 |  |  | 2018 |
Beginning balance |  | $ | 6,113 |  |  | $ | 7,779 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Relating to assets still held at reporting date |  |  | 216 |  |  |  | (58 | )
Purchases, sales and settlements, net |  |  | (158 | ) |  |  | (1,608 | )
Ending balance |  | $ | 6,171 |  |  | $ | 6,113 |
Schedule of Expected Benefit Payments [Table Text Block] |
|  |  |  |  |  | Other |
|  | Pension |  |  | Postretirement |
|  | Benefits |  |  | Benefits |
2020 |  | $ | 9,411 |  |  | $ | 977 |
2021 |  |  | 8,336 |  |  |  | 905 |
2022 |  |  | 8,138 |  |  |  | 825 |
2023 |  |  | 7,737 |  |  |  | 753 |
2024 |  |  | 7,395 |  |  |  | 681 |
Years 2025 - 2029 |  |  | 32,656 |  |  |  | 2,549 |

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