Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Patents (Details Textual)

v3.19.1
Note 7 - Patents (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Amortization of Intangible Assets, Total $ 13,252 $ 237,366  
Impairment of Intangible Assets, Finite-lived     $ 1,500,000
Patents [Member]      
Amortization of Intangible Assets, Total $ 13,252 $ 237,366  
Patents [Member] | Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life 3 years    
Patents [Member] | Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life 20 years