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Note 7 - Summary of Warrants (Details)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Outstanding January 1, 2016 (in shares) | shares 3,403,367
Outstanding January 1, 2016 (in dollars per share) | $ / shares $ 1.05
Granted (in shares) | shares 423,291
Granted (in dollars per share) | $ / shares $ 1.25
Outstanding June 30, 2016 (in shares) | shares 3,826,658
Outstanding June 30, 2016 (in dollars per share) | $ / shares $ 1.07