Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Patents (Details Textual)

v3.19.2
Note 7 - Patents (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Amortization of Intangible Assets, Total     $ 26,506 $ 469,356  
Impairment of Intangible Assets, Finite-lived         $ 1,500,000
Patents [Member]          
Amortization of Intangible Assets, Total $ 13,000 $ 232,000 $ 26,500 $ 469,000  
Patents [Member] | Minimum [Member]          
Finite-Lived Intangible Asset, Useful Life     3 years    
Patents [Member] | Maximum [Member]          
Finite-Lived Intangible Asset, Useful Life     20 years