4. Fair Value of Financial Instruments (Details 1) - USD ($) |
Dec. 31, 2019 |
Jun. 30, 2019 |
|---|---|---|
| Cost | $ 30,000 | $ 339,400 |
| Fair value | (15,300) | 330,900 |
| Unrealized holding gain (loss) | 14,700 | (8,500) |
| Equity Securities | ||
| Cost | 79,500 | 47,100 |
| Fair value | 251,000 | 72,000 |
| Unrealized holding gain (loss) | 330,500 | 24,900 |
| Mutual Funds | ||
| Cost | 109,500 | 292,300 |
| Fair value | 235,700 | 258,900 |
| Unrealized holding gain (loss) | $ 345,200 | $ (33,400) |