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Note 6 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based compensation expense $ 142,839 $ 131,054 $ 655,558 $ 657,088
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 140,328 115,526 581,636 568,613
Research and Development Expense [Member]        
Share-based compensation expense $ 2,511 $ 15,528 $ 73,922 $ 88,475