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Note 3 - Intangible Assets (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Impairment of Intangible Assets, Finite-lived $ 0 $ 0
Licensing Agreements [Member]    
Royalty Expense $ 13,000 $ 11,000
Licensing Agreements [Member] | Minimum [Member]    
Payment of Royalty in Percentage 3.00%  
Licensing Agreements [Member] | Maximum [Member]    
Payment of Royalty in Percentage 5.00%