7. Earnings (Loss) Per Common Share (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Earnings Per Share [Abstract] | ||||
| Net income (loss) | $ 3,600 | $ 118,400 | $ (52,600) | $ 260,500 |
| Weighted average common shares outstanding | 1,499,396 | 1,494,112 | 1,496,718 | 1,494,112 |
| Effect of dilutive securities | 58,330 | 18,839 | 0 | 11,368 |
| Weighted average dilutive common shares outstanding | 1,557,726 | 1,512,951 | 1,496,718 | 1,505,480 |
| Basic earnings (loss) per common share | $ 0 | $ 0.08 | $ (0.04) | $ 0.17 |
| Diluted earnings (loss) per common share | $ 0 | $ 0.08 | $ (0.04) | $ 0.17 |