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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based compensation expense $ 137,101 $ 196,346 $ 794,189 $ 895,821
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 121,999 170,758 690,612 770,524
Research and Development Expense [Member]        
Share-based compensation expense $ 15,102 $ 25,588 $ 103,577 $ 125,297