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Note 5 - Share Based Compensation - Expenses for Continuing Operations (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based compensation expense $ 512,719 $ 526,033
Selling, General and Administrative Expenses [Member]    
Share-based compensation expense 441,308 453,086
Research and Development Expense [Member]    
Share-based compensation expense $ 71,411 $ 72,947