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Note 9 - Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant [Member] - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Outstanding (in shares) 1,642,902  
Outstanding, weighted average exercise price (in dollars per share) $ 0.32  
Outstanding, weighted average remaining contractual life (Year) 3 years 4 years 182 days
Outstanding, aggregate intrinsic value $ 6 $ 539
Issued (in shares)  
Issued, weighted average exercise price (in dollars per share)  
Issued, weighted average remaining contractual life (Year)  
Issued, aggregate intrinsic value  
Exercised (in shares) (1,612,902)  
Exercised, weighted average exercise price (in dollars per share) $ 0.31  
Forfeited/Cancelled (in shares)  
Forfeited/Cancelled, weighted average exercise price (in dollars per share)  
Outstanding (in shares) 30,000 1,642,902
Outstanding, weighted average exercise price (in dollars per share) $ 0.70 $ 0.32
Exercisable (in shares) 30,000  
Exercisable, weighted average exercise price (in dollars per share) $ 0.70  
Exercisable, weighted average remaining contractual life (Year) 3 years  
Exercisable, aggregate intrinsic value $ 6