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Note 5 - Accounts Receivable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Noncurrent $ 1,720,000   $ 1,720,000   $ 1,720,000    
Percentage of Remaining Balance Owned Reserved     100.00%   100.00%    
Revenue from Contract with Customer, Including Assessed Tax 307,142 $ 728,383 $ 829,627 $ 1,280,006      
License [Member]              
Revenue from Contract with Customer, Including Assessed Tax $ 23,542 $ 60,300 $ 258,887 $ 143,508      
License [Member] | CHINA              
Revenue from Contract with Customer, Including Assessed Tax           $ 1,100,000  
Receivables, Net, Current, Total             $ 555,555
Accounts Receivable, Allowance for Credit Loss, Writeoff         $ 1.10