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Note 10 - Retirement Plans (Tables) | 12 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
|  | 2021 |  |  | 2020 |
|  | (In thousands) |
Change in Benefit Obligation |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 278,227 |  |  | $ | 250,461 |
Service cost |  |  | 9,326 |  |  |  | 9,244 |
Interest cost |  |  | 9,266 |  |  |  | 9,064 |
Liability gain due to curtailment |  |  | - |  |  |  | (1,114 | )
Actuarial loss |  |  | 17,712 |  |  |  | 20,146 |
Benefit payments and expenses |  |  | (28,468 | ) |  |  | (9,574 | )
Benefit obligation at end of year |  | $ | 286,063 |  |  | $ | 278,227 |
Change in Plan Assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 202,485 |  |  | $ | 233,112 |
Actual return on plan assets |  |  | 103,166 |  |  |  | (46,325 | )
Employer contributions |  |  | 73,000 |  |  |  | 26,000 |
Benefit payments and expenses |  |  | (29,737 | ) |  |  | (10,302 | )
Fair value of plan assets at end of year |  | $ | 348,914 |  |  | $ | 202,485 |
Funded (Unfunded) Status |  | $ | 62,851 |  |  | $ | (75,742 | )
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  | 2021 |  |  | 2020 |
|  | (In thousands) |
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss |  |  |  |  |  |  |  |
Prior service cost |  | $ | (258 | ) |  | $ | (349 | )
Net loss |  |  | (26,265 | ) |  |  | (105,866 | )
Accumulated other comprehensive pre-tax loss |  | $ | (26,523 | ) |  | $ | (106,215 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Pension and |
|  | post retirement plan |
|  | adjustments, net |
|  | of tax |
|  | (In thousands) |
Accumulated Other Comprehensive Loss |  |  |  |
Balance at March 31, 2020 |  | $ | (79,220 | )
Other comprehensive income |  |  | 60,153 |
Balance at March 31, 2021 |  | $ | (19,067 | )
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | 2021 |  |  | 2020 |
|  | (In thousands) |
Service cost including administration |  | $ | 10,627 |  |  | $ | 9,935 |
Interest cost |  |  | 9,266 |  |  |  | 9,064 |
Expected return on plan assets |  |  | (15,804 | ) |  |  | (16,746 | )
Amortization of net loss |  |  | 9,919 |  |  |  | 579 |
Prior service cost |  |  | 91 |  |  |  | 120 |
Net periodic benefit cost |  | $ | 14,099 |  |  | $ | 2,952 |
Settlement/curtailment expense |  |  | - |  |  |  | 118 |
Net periodic benefit cost with curtailment |  | $ | 14,099 |  |  | $ | 3,070 |
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |
Weighted Average Assumptions for Balance Sheet Liability at End of Year: |  |  |  |  |  |  |  |
Discount rate - projected benefit obligation |  |  | 3.43 | % |  |  | 3.69 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | %
Mortality table |  |  | Pri-2012 Blue Collar Generational Table Improvement Scale MP-2020 |  |  |  | Pri-2012 Blue Collar Generational Table Improvement Scale MP-2019 |
Weighted Average Assumptions for Benefit Cost at Beginning of Year: |  |  |  |  |  |  |  |
Discount rate - benefit obligations |  |  | 3.69 | % |  |  | 4.14 | %
Discount rate - interest cost |  |  | 3.30 | % |  |  | 3.74 | %
Discount rate - service cost |  |  | 3.87 | % |  |  | 4.34 | %
Discount rate - interest on service cost |  |  | 3.43 | % |  |  | 3.69 | %
Expected return on plan assets |  |  | 7.25 | % |  |  | 7.25 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Target |  |  | Percentage of Plan |
|  | Allocation |  |  | Assets at March 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Plan Assets |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | 50 | % |  |  | 48 | % |  |  | 97 | %
Debt securities |  |  | 50 | % |  |  | 50 | % |  |  | - |
Real estate |  |  | - |  |  |  | - |  |  |  | - |
Cash |  |  | - |  |  |  | 2 | % |  |  | 3 | %
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Schedule of Expected Contributions [Table Text Block] |
Expected Employer Contributions |  | $ | - |
Expected Employee Contributions |  | $ | - |
Schedule of Expected Benefit Payments [Table Text Block] |
2022 |  |  | $ | 11,178 |
2023 |  |  |  | 11,290 |
2024 |  |  |  | 11,913 |
2025 |  |  |  | 12,640 |
2026 |  |  |  | 13,342 |
2027-2031 |  |  |  | 75,496 |

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