6. Goodwill and Other Intangible Assets (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Cost $ 2,388,000 $ 2,380,500
Accumulated amortization 2,244,800 2,205,500
Net $ 143,200 $ 175,000
Technology, trademarks    
Useful lives minimum 5 years 5 years
Useful lives maximum 10 years 10 years
Cost $ 663,800 $ 663,800
Accumulated amortization 661,800 661,700
Net $ 2,000 $ 2,100
Trade names    
Useful lives 6 years 6 years
Cost $ 140,000 $ 140,000
Accumulated amortization 136,200 124,400
Net $ 3,800 $ 15,600
Websites    
Useful lives 5 years 5 years
Cost $ 210,000 $ 210,000
Accumulated amortization 210,000 210,000
Net $ 0 $ 0
Customer relationships    
Useful lives minimum 9 years 9 years
Useful lives maximum 10 years 10 years
Cost $ 357,000 $ 357,000
Accumulated amortization 314,700 308,100
Net $ 42,300 $ 48,900
Sublicense agreements    
Useful lives 10 years 10 years
Cost $ 294,000 $ 294,000
Accumulated amortization 238,900 224,100
Net $ 55,100 $ 69,900
Non-compete agreements    
Useful lives 5 years 5 years
Cost $ 384,000 $ 384,000
Accumulated amortization 384,000 384,000
Net $ 0 $ 0
Intellectual property, research & development (IPR&D)    
Useful lives 3 years 3 years
Cost $ 110,000 $ 110,000
Accumulated amortization 110,000 110,000
Net $ 0 $ 0
Other intangible assets    
Useful lives 5 years 5 years
Cost $ 229,200 $ 221,700
Accumulated amortization 189,200 183,200
Net $ 40,000 $ 38,500