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Note 7 - Commitments and Contingencies (Details Textual) - Licensing Agreement with University of Florida Research Foundation [Member] - USD ($)
12 Months Ended
Dec. 22, 2011
Dec. 31, 2019
Dec. 31, 2018
Royalty Term 10 years    
Annual License Maintenance Fee $ 10,000    
License Maintenance Fee [Member]      
Royalty Expense   $ 10,000 $ 10,000
Minimum [Member]      
Royalty Fee Percentage of Net Sales 2.50%    
Maximum [Member]      
Royalty Fee Percentage of Net Sales 5.00%