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Note 8 - Stock Option Activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2016
Jan. 08, 2016
Diffusion LLC [Member]    
Assumed in connection with Merger (in shares) 3,011,498  
Assumed in connection with Merger (in dollars per share) $ 4.02  
Balance at January 1, 2016 (in shares) 14,955,753  
Balance at January 1, 2016 (in dollars per share) $ 0.39  
Cancelled (in shares) (3,652)  
Cancelled (in dollars per share) $ 1.36  
Options outstanding (in shares) 17,963,599  
Options outstanding, weighted-average per share exercise price (in dollars per share) $ 1  
Options outstanding, weighted-average remaining contractual life 7 years 292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 12,306,562 3,011,498
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 1.23 $ 4.02
Exercisable at March 31, 2016 7 years 36 days  
Vested and expected to vest at March 31, 2016 (in shares) 17,929,054  
Vested and expected to vest at March 31, 2016 (in dollars per share) $ 1  
Vested and expected to vest at March 31, 2016 7 years 292 days