4. Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Assets:
Cash and cash equivalents	$ 897,100	$ 1,245,000	$ 666,900	$ 482,000
Available for sale securities	290,900	290,100
Total	1,188,000	1,535,100
Liabilities:
Contingent consideration	228,900	346,300
Level 1
Assets:
Cash and cash equivalents	897,100	1,245,000
Available for sale securities	290,900	290,100
Total	1,188,000	1,535,100
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	$ 228,900	$ 346,300