3. Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Assets
Cash and cash equivalents	$ 7,559,700	$ 1,602,500	$ 1,053,100
Available for sale securities	331,800	330,900
Total	7,891,500	1,933,400
Liabilities:
Contingent consideration	358,000	618,000	$ 408,000
Level 1
Assets
Cash and cash equivalents	7,559,700	1,602,500
Available for sale securities	331,800	330,900
Total	7,891,500	1,933,400
Liabilities:
Contingent consideration	0	0
Level 2
Assets
Cash and cash equivalents	0	0
Available for sale securities	0	0
Total	0	0
Liabilities:
Contingent consideration	0	0
Level 3
Assets
Cash and cash equivalents	0	0
Available for sale securities	0	0
Total	0	0
Liabilities:
Contingent consideration	$ 358,000	$ 618,000