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Note 7 - Summary of Warrants (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Outstanding January 1, 2016 (in shares) 3,403,367 3,153,367 3,153,367
Outstanding January 1, 2016 (in dollars per share) $ 1.05 $ 1 $ 1.01
Granted (in shares) 423,291 250,000
Granted (in dollars per share) $ 1.25 $ 1.25
Outstanding September 30, 2016 (in shares) 3,826,658 3,403,367 3,153,367
Outstanding September 30, 2016 (in dollars per share) $ 1.07 $ 1.05 $ 1