Annual report pursuant to Section 13 and 15(d)

Note 6 - Patents (Details Textual)

v3.19.1
Note 6 - Patents (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years 109 days  
Asset Impairment Charges, Total $ 0 $ 0
Amortization of Intangible Assets, Total 102,000 $ 189,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 80,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 80,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 80,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 80,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 80,000