Balance Sheets (Parenthetical) - USD ($) |
Jun. 30, 2020 |
Jun. 30, 2019 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for doubtful accounts | $ 3,000 | $ 3,000 |
| Common stock, par value | $ 0.3333 | $ 0.3333 |
| Common stock, shares authorized | 10,000,000 | 10,000,000 |
| Common stock, shares issued | 3,029,874 | 3,029,874 |
| Common stock, shares outstanding | 2,402,633 | 2,401,213 |
| Unearned ESOP, shares | 0 | 14,166 |
| Treasury stock, shares | 627,241 | 628,661 |