Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Patents (Details Textual)

v3.20.2
Note 7 - Patents (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Amortization of Intangible Assets, Total $ 13,000 $ 13,000 $ 39,759 $ 39,760
Patents [Member] | Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)     3 years  
Patents [Member] | Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)     20 years