Note 9 - Retirement Plans - Plan Assets (Details) |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Target Allocation | 100.00% | |
| Percentage of Plan Assets | 100.00% | 100.00% |
| Defined Benefit Plan, Equity Securities [Member] | ||
| Target Allocation | 25.00% | |
| Percentage of Plan Assets | 24.00% | 15.00% |
| Defined Benefit Plan, Debt Security [Member] | ||
| Target Allocation | 69.00% | |
| Percentage of Plan Assets | 72.00% | 80.00% |
| Employee Benefit Plan, Real Estate [Member] | ||
| Target Allocation | 3.00% | |
| Percentage of Plan Assets | 2.00% | 2.00% |
| Defined Benefit Plan, Cash [Member] | ||
| Target Allocation | 1.00% | |
| Percentage of Plan Assets | 1.00% | 1.00% |
| Defined Benefit Plan, Other [Member] | ||
| Target Allocation | 2.00% | |
| Percentage of Plan Assets | 1.00% | 2.00% |