4. Fair Value of Financial Instruments (Details) - USD ($) |
Dec. 31, 2019 |
Jun. 30, 2019 |
Dec. 31, 2018 |
Jun. 30, 2018 |
|---|---|---|---|---|
| Assets: | ||||
| Cash and cash equivalents | $ 1,044,000 | $ 1,602,500 | $ 1,358,100 | $ 1,053,100 |
| Investment securities | 345,200 | 330,900 | ||
| Total | 1,389,200 | 1,933,400 | ||
| Liabilities: | ||||
| Contingent consideration | 618,000 | 618,000 | ||
| Level 1 | ||||
| Assets: | ||||
| Cash and cash equivalents | 1,044,000 | 1,602,500 | ||
| Investment securities | 345,200 | 330,900 | ||
| Total | 1,389,200 | 1,933,400 | ||
| Liabilities: | ||||
| Contingent consideration | 0 | 0 | ||
| Level 2 | ||||
| Assets: | ||||
| Cash and cash equivalents | 0 | 0 | ||
| Investment securities | 0 | 0 | ||
| Total | 0 | 0 | ||
| Liabilities: | ||||
| Contingent consideration | 0 | 0 | ||
| Level 3 | ||||
| Assets: | ||||
| Cash and cash equivalents | 0 | 0 | ||
| Investment securities | 0 | 0 | ||
| Total | 0 | 0 | ||
| Liabilities: | ||||
| Contingent consideration | $ 618,000 | $ 618,000 |