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Note 13 - Commitment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 25, 2020
Sep. 30, 2020
Sep. 30, 2020
Mar. 30, 2020
Feb. 14, 2020
Nov. 11, 2015
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1.50 $ 0.65 $ 3.60
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member]            
Related Party Agreement, Term (Year) 1 year          
Related Party Transaction, Revenue Needed to Trigger Payment of Sales Incentive Fee $ 5,000,000          
Related Party Transaction, Revenue to Trigger Payment of Sales Incentive Fee, Percent of Net Income, Minimum 20.00%          
Related Party Transaction, Sales Incentive Fee For Each 5 Million Revenue $ 500,000          
Stock Issuable for Sales Incentive Fee Per Each 5 Million Revenue (in shares) 500,000          
Related Party Transaction, Maximum Revenue, Warrants Issuable $ 25,000,000          
Revenue from Related Parties   $ 0 $ 0      
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] | Warrants Issuable for Each 1 Million Revenue in Excess of 20 Million [Member]            
Warrants and Rights Outstanding, Term (Year) 5 years          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 100,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.50          
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] | Maximum [Member]            
Related Party Transaction, Maximum Revenue to Trigger Payment of Sales Incentive Fee $ 20,000,000          
Stock Issuable for Sales Incentive Agreement (in shares) 2,000,000          
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] | Maximum [Member] | Warrants Issuable for Sales Incentive Agreement [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 500,000