| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
| | | Unrealized | |
| | | (Losses) Gains | |
| | | on Securities | |
| | | Available-for-Sale | |
| | | (In Thousands) | |
| Balance, April 1, 2025 | | $ | (18,945 | ) |
| Other comprehensive income, before reclassifications and income taxes | | | 1,475 | |
| Amounts reclassified from accumulated other comprehensive loss, before income taxes | | | - | |
| Income tax provision | | | (388 | ) |
| Total other comprehensive income | | | 1,087 | |
| Balance, June 30, 2025 | | $ | (17,858 | ) |
| | | | | |
| Balance, April 1, 2024 | | $ | (21,263 | ) |
| Other comprehensive income, before reclassifications and income taxes | | | 524 | |
| Amounts reclassified from accumulated other comprehensive loss, before income taxes | | | - | |
| Income tax provision | | | (138 | ) |
| Total other comprehensive income | | | 386 | |
| Balance, June 30, 2024 | | $ | (20,877 | ) |
| | | | | |
| Balance, January 1, 2025 | | $ | (20,146 | ) |
| Other comprehensive income, before reclassifications and income taxes | | | 3,115 | |
| Amounts reclassified from accumulated other comprehensive loss, before income taxes | | | - | |
| Income tax provision | | | (827 | ) |
| Total other comprehensive income | | | 2,288 | |
| Balance, June 30, 2025 | | $ | (17,858 | ) |
| | | | | |
| Balance, January 1, 2024 | | $ | (19,945 | ) |
| Other comprehensive loss, before reclassifications and income taxes | | | (1,265 | ) |
| Amounts reclassified from accumulated other comprehensive loss, before income taxes | | | - | |
| Income tax benefit | | | 333 | |
| Total other comprehensive loss | | | (932 | ) |
| Balance, June 30, 2024 | | $ | (20,877 | ) |
|