Note M - Pension and Other Postretirement Benefit Plans (Tables)
|
12 Months Ended |
Jun. 30, 2026 |
| Notes Tables |
|
| Schedule of Net Funded Status [Table Text Block] |
| | | | | | | | | | | Other | |
| | | Pension | | | Postretirement | |
| | | Benefits | | | Benefits | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Change in benefit obligation: | | | | | | | | | | | | | | | | |
| Benefit obligation, beginning of year | | $ | 66,424 | | | $ | 68,110 | | | $ | 2,870 | | | $ | 3,169 | |
| Service cost | | | 352 | | | | 352 | | | | 5 | | | | 7 | |
| Interest cost | | | 3,132 | | | | 3,404 | | | | 139 | | | | 165 | |
| Prior service cost (benefit) | | | 21 | | | | 21 | | | | - | | | | - | |
| Actuarial loss (gain) | | | 82 | | | | 1,753 | | | | (9 | ) | | | 33 | |
| Contributions by plan participants | | | 139 | | | | 137 | | | | 159 | | | | 155 | |
| Benefits paid | | | (7,977 | ) | | | (7,353 | ) | | | (660 | ) | | | (659 | ) |
| Benefit obligation, end of year | | $ | 62,173 | | | $ | 66,424 | | | $ | 2,504 | | | $ | 2,870 | |
| | | | | | | | | | | | | | | | | |
| Change in plan assets: | | | | | | | | | | | | | | | | |
| Fair value of assets, beginning of year | | $ | 56,860 | | | $ | 62,660 | | | $ | - | | | $ | - | |
| Actual return on plan assets | | | 3,737 | | | | 2,616 | | | | - | | | | - | |
| Return on plan assets | | | - | | | | (1,808 | ) | | | - | | | | | |
| Employer contribution | | | 656 | | | | 608 | | | | 501 | | | | 504 | |
| Contributions by plan participants | | | 139 | | | | 137 | | | | 159 | | | | 155 | |
| Benefits paid | | | (7,977 | ) | | | (7,353 | ) | | | (660 | ) | | | (659 | ) |
| Fair value of assets, end of year | | $ | 53,415 | | | $ | 56,860 | | | $ | - | | | $ | - | |
| | | | | | | | | | | | | | | | | |
| Funded status | | $ | (8,758 | ) | | $ | (9,564 | ) | | $ | (2,504 | ) | | $ | (2,870 | ) |
| | | | | | | | | | | | | | | | | |
| Amounts recognized in the balance sheet consist of: | | | | | | | | | | | | | | | | |
| Other assets - noncurrent | | $ | 40 | | | $ | 15 | | | $ | - | | | $ | - | |
| Accrued liabilities - current | | | (282 | ) | | | (380 | ) | | | (591 | ) | | | (237 | ) |
| Accrued retirement benefits - noncurrent | | | (8,516 | ) | | | (9,199 | ) | | | (1,913 | ) | | | (2,633 | ) |
| Net amount recognized | | $ | (8,758 | ) | | $ | (9,564 | ) | | $ | (2,504 | ) | | $ | (2,870 | ) |
| | | | | | | | | | | | | | | | | |
| Amounts recognized in accumulated other comprehensive income (loss) consist of (net of tax): | | | | | | | | | | | | | |
| Net transition obligation | | $ | - | | | $ | 26 | | | $ | - | | | $ | - | |
| Prior service benefit | | | (180 | ) | | | (185 | ) | | | - | | | | - | |
| Actuarial net loss (gain) | | | 9,212 | | | | 11,937 | | | | (279 | ) | | | (317 | ) |
| Net amount recognized | | $ | 9,032 | | | $ | 11,778 | | | $ | (279 | ) | | $ | (317 | ) |
|
| 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 | | $ | - | | | $ | - | |
| Prior service cost (benefit) | | | 36 | | | | - | |
| Actuarial net loss (gain) | | | 226 | | | | (49 | ) |
| Net amount to be recognized | | $ | 262 | | | $ | (49 | ) |
|
| Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] |
| | | June 30 | |
| | | 2026 | | | 2025 | |
| Projected and accumulated benefit obligation | | $ | 58,323 | | | $ | 62,355 | |
| Fair value of plan assets | | | 49,525 | | | | 52,776 | |
|
| Schedule of Net Benefit Costs [Table Text Block] |
| | | Pension Benefits | |
| | | 2026 | | | 2025 | |
| Service cost | | $ | 356 | | | $ | 347 | |
| Interest cost | | | 3,134 | | | | 3,400 | |
| Prior service cost | | | 21 | | | | 21 | |
| Expected return on plan assets | | | (3,043 | ) | | | (3,411 | ) |
| Amortization of transition obligation | | | 33 | | | | 42 | |
| Amortization of prior service cost | | | - | | | | 26 | |
| Amortization of actuarial net loss | | | 2,590 | | | | 984 | |
| Net periodic benefit cost (income) | | $ | 3,091 | | | $ | 1,409 | |
| | | Other Postretirement Benefits | |
| | | 2026 | | | 2025 | |
| Service cost | | $ | 5 | | | $ | 7 | |
| Interest cost | | | 139 | | | | 165 | |
| Amortization of prior service cost | | | - | | | | - | |
| Amortization of actuarial net loss (gain) | | | (53 | ) | | | (262 | ) |
| Net periodic benefit cost (income) | | $ | 91 | | | $ | (90 | ) |
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| Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| | | | | | | Other | |
| | | | | | | Postretirement | |
| | | Pension | | | Benefits | |
| Net loss (gain) | | $ | (624 | ) | | $ | (10 | ) |
| Amortization of transition asset | | | (32 | ) | | | - | |
| Amortization of prior service cost (benefit) | | | (1 | ) | | | - | |
| Amortization of net loss (gain) | | | (2,590 | ) | | | 53 | |
| Translation | | | (110 | ) | | | - | |
| Total recognized in other comprehensive income (loss) | | | (3,357 | ) | | | 43 | |
| Net periodic benefit cost (income) | | | 3,091 | | | | 91 | |
| Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | | $ | (266 | ) | | $ | 134 | |
| | | | | | | Other | |
| | | | | | | Postretirement | |
| | | Pension | | | Benefits | |
| Net loss (income) | | $ | 2,487 | | | $ | 34 | |
| Amortization of transition asset | | | (43 | ) | | | - | |
| Amortization of prior service cost (benefit) | | | (27 | ) | | | - | |
| Amortization of net loss (gain) | | | (985 | ) | | | 262 | |
| Translation | | | (154 | ) | | | - | |
| Total recognized in other comprehensive income (loss) | | | 1,278 | | | | 296 | |
| Net periodic benefit cost (income) | | | 1,409 | | | | (90 | ) |
| Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) | | $ | 2,687 | | | $ | 206 | |
|
| Defined Benefit Plan, Assumptions [Table Text Block] |
| | | | | | | | | | | Other | |
| | | Pension Benefits | | | Postretirement Benefits | |
| Weighted average assumptions used to determine benefit obligations at June 30 | | | | | | | | | | | | | | | | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Discount rate | | | 4.90 | % | | | 5.00 | % | | | 5.02 | % | | | 5.28 | % |
| Expected return on plan assets | | | 5.78 | % | | | 5.74 | % | | | | | | | | |
| | | | | | | | | | | Other | |
| | | Pension Benefits | | | Postretirement Benefits | |
| Weighted average assumptions used to determine net periodic benefit costs for years ended June 30 | | | | | | | | | | | | | | | | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Discount rate | | | 4.79 | % | | | 4.97 | % | | | 5.28 | % | | | 5.66 | % |
| Expected return on plan assets | | | 5.56 | % | | | 5.55 | % | | | | | | | | |
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| Schedule of Plan Weighted Average Assets Allocations [Table Text Block] |
| | | Target | | | June 30 | |
| Asset Category | | Allocation | | | 2026 | | | 2025 | |
| Equity securities | | | 15% | | | | 16% | | | | 15% | |
| Debt securities | | | 75% | | | | 76% | | | | 78% | |
| Real estate | | | 10% | | | | 8% | | | | 7% | |
| | | | 100% | | | | 100% | | | | 100% | |
|
| Schedule of Allocation of Plan Assets [Table Text Block] |
| | | Total | | | Level I | | | Level II | | | Level III | |
| Cash and cash equivalents | | $ | 855 | | | $ | 855 | | | $ | - | | | $ | - | |
| Equity securities: | | | | | | | | | | | | | | | | |
| Company common stock (a) | | | 794 | | | | 794 | | | | - | | | | - | |
| Common stock (a) | | | 2,647 | | | | 2,647 | | | | - | | | | - | |
| Mutual funds (b) | | | 4,090 | | | | 4,090 | | | | - | | | | - | |
| Annuity contracts (c) | | | 6,423 | | | | - | | | | - | | | | 6,423 | |
| Total | | $ | 14,809 | | | $ | 8,386 | | | $ | - | | | $ | 6,423 | |
| Investments Measured at Net Asset Value (d) | | | 38,606 | | | | | | | | | | | | | |
| Total | | $ | 53,415 | | | | | | | | | | | | | |
| | | Total | | | Level I | | | Level II | | | Level III | |
| Cash and cash equivalents | | $ | 924 | | | $ | 924 | | | $ | - | | | $ | - | |
| Equity securities: | | | | | | | | | | | | | | | | |
| Company common stock (a) | | | 867 | | | | 867 | | | | - | | | | - | |
| Common stock (a) | | | 2,537 | | | | 2,537 | | | | - | | | | - | |
| Mutual funds (b) | | | 4,434 | | | | 4,434 | | | | - | | | | - | |
| Annuity contracts (c) | | | 7,080 | | | | - | | | | - | | | | 7,080 | |
| Total | | $ | 15,842 | | | $ | 8,762 | | | $ | - | | | $ | 7,080 | |
| Investments Measured at Net Asset Value (d) | | | 41,018 | | | | | | | | | | | | | |
| Total | | $ | 56,860 | | | | | | | | | | | | | |
| | | 2026 | | | 2025 | |
| Fixed income funds | | $ | 35,118 | | | $ | 37,687 | |
| Real estate | | | 3,488 | | | | 3,331 | |
| Total | | $ | 38,606 | | | $ | 41,018 | |
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| Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
| | | 2026 | | | 2025 | |
| Beginning balance | | $ | 7,080 | | | $ | 6,264 | |
| Actual return on plan assets: | | | | | | | | |
| Relating to assets still held at reporting date | | | 480 | | | | 1,362 | |
| Purchases, sales and settlements, net | | | (1,137 | ) | | | (546 | ) |
| Ending balance | | $ | 6,423 | | | $ | 7,080 | |
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| Schedule of Expected Benefit Payments [Table Text Block] |
| | | | | | | Other | |
| | | Pension | | | Postretirement | |
| | | Benefits | | | Benefits | |
| | | | | | | | | |
| 2027 | | $ | 6,624 | | | $ | 591 | |
| 2028 | | | 6,544 | | | | 449 | |
| 2029 | | | 6,352 | | | | 305 | |
| 2030 | | | 2,867 | | | | 273 | |
| 2031 | | | 5,915 | | | | 239 | |
| Years 2032 - 2036 | | | 27,160 | | | | 647 | |
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