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Note 10 - Retirement Plans (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
|  | Fiscal Year: |
|  | 2022 |  |  | 2021 |
Change in benefit obligation |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 286,063 |  |  | $ | 278,227 |
Service cost |  |  | 8,483 |  |  |  | 9,326 |
Interest cost |  |  | 7,721 |  |  |  | 9,266 |
Actuarial (gain) loss |  |  | (972 | ) |  |  | 17,712 |
Benefit payments and expenses |  |  | (26,294 | ) |  |  | (28,468 | )
Benefit obligation at end of year |  | $ | 275,001 |  |  | $ | 286,063 |
Change in plan assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 348,914 |  |  | $ | 202,485 |
Actual return on plan assets |  |  | 6,666 |  |  |  | 103,166 |
Employer contributions |  |  | - |  |  |  | 73,000 |
Benefit payments and expenses |  |  | (27,713 | ) |  |  | (29,737 | )
Fair value of plan assets at end of year |  | $ | 327,867 |  |  | $ | 348,914 |
Funded status |  | $ | 52,866 |  |  | $ | 62,851 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  | Fiscal Year: |
|  | 2022 |  |  | 2021 |
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss |  |  |  |  |  |  |  |
Prior service cost |  | $ | (167 | ) |  | $ | (258 | )
Net loss |  |  | (36,136 | ) |  |  | (26,265 | )
Accumulated other comprehensive pre-tax loss |  | $ | (36,303 | ) |  | $ | (26,523 | )
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | Fiscal Year: |
|  | 2022 |  |  | 2021 |
Service cost including administration |  | $ | 9,508 |  |  | $ | 10,627 |
Interest cost |  |  | 7,721 |  |  |  | 9,266 |
Expected return on plan assets |  |  | (17,114 | ) |  |  | (15,804 | )
Amortization of net loss |  |  | - |  |  |  | 9,919 |
Prior service cost |  |  | 91 |  |  |  | 91 |
Net periodic benefit cost |  | $ | 206 |  |  | $ | 14,099 |
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | Fiscal Year: |
|  | 2022 |  |  | 2021 |
Weighted Average Assumptions for Balance Sheet Liability at End of Year: |  |  |  |  |  |  |  |
Discount rate - projected benefit obligation |  |  | 3.81 | % |  |  | 3.43 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | %
Mortality table |  | Pri-2012 Blue Collar Generational Table Improvement Scale MP-2021 |  |  | Pri-2012 Blue Collar Generational Table Improvement Scale MP-2020 |
Weighted Average Assumptions for Benefit Cost at Beginning of Year: |  |  |  |  |  |  |  |
Discount rate - benefit obligations |  |  | 3.43 | % |  |  | 3.69 | %
Discount rate - interest cost |  |  | 2.68 | % |  |  | 3.30 | %
Discount rate - service cost |  |  | 3.75 | % |  |  | 3.87 | %
Expected return on plan assets |  |  | 5.00 | % |  |  | 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, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Equity securities |  |  | 19 | % |  |  | 21 | % |  |  | 48 | %
Debt securities |  |  | 72 | % |  |  | 61 | % |  |  | 50 | %
Real estate |  |  | 6 | % |  |  | 7 | % |  |  | - |
Cash |  |  | - |  |  |  | 7 | % |  |  | 2 | %
Other |  |  | 3 | % |  |  | 4 | % |  |  | - |
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Defined Benefit Plan, Plan Assets, Category [Table Text Block] |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  | ` |  | Subtotal |  |  | Measured at NAV (1) |  |  | Total |
Equity securities |  | $ | 29,427 |  |  | $ | - |  |  | $ | - |  |  |  | $ | 29,427 |  |  | $ | - |  |  | $ | 29,427 |
Held in common/collective trusts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  | - |  |  |  | 40,969 |  |  |  | 40,969 |
Real estate |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  | - |  |  |  | 23,200 |  |  |  | 23,200 |
Debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  | - |  |  |  | 200,224 |  |  |  | 200,225 |
Cash/short-term investments (2) |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  | - |  |  |  | 22,224 |  |  |  | 22,224 |
Other investments |  |  | - |  |  |  | - |  |  |  | - |  |  |  |  | - |  |  |  | 11,822 |  |  |  | 11,822 |
Fair value of plan assets |  | $ | 29,427 |  |  | $ | - |  |  | $ | - |  |  |  | $ | 29,427 |  |  | $ | 298,439 |  |  | $ | 327,867 |
Schedule of Expected Contributions [Table Text Block] |
Expected Employer Contributions |  | $ | - |
Expected Employee Contributions |  | $ | - |
Schedule of Expected Benefit Payments [Table Text Block] |
2023 |  |  |  | $ | 10,101 |
2024 |  |  |  |  | 10,773 |
2025 |  |  |  |  | 11,550 |
2026 |  |  |  |  | 12,349 |
2027 |  |  |  |  | 13,116 |
2028 | - | 2032 |  |  | 75,037 |

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