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Note 9 - Licensing Agreements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Licensing Agreements [Member]            
Royalty Payment, Percentage 2.50%   2.50%   2.50%  
Up-front Sub-license Fees, Percentage 10.00%   10.00%   10.00%  
Interest on Amounts Owed Under License Agreement, Rate 3.00%   3.00%   3.00%  
Revenues $ 0 $ 0 $ 0 $ 0