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Note 10 - Stock Options and Restricted Stock - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Outstanding (in shares)   4,814,434    
Outstanding, weighted average exercise price (in dollars per share)   $ 0.71    
Outstanding, weighted average remaining contractual life (Year)   2 years 295 days   3 years 167 days
Outstanding, aggregate intrinsic value $ 834 $ 834   $ 1,007
Granted (in shares) 0 0 2,971,600  
Granted, weighted average exercise price (in dollars per share)      
Granted, weighted average remaining contractual life (Year)      
Granted, aggregate intrinsic value      
Exercised (in shares)   (1,230,002) 0  
Exercised, weighted average exercise price (in dollars per share)      
Forfeited or Expired (in shares)   (958,333)    
Forfeited or Expired, weighted average exercise price (in dollars per share)   $ 0.73    
Forfeited or Expired, weighted average remaining contractual life (Year)      
Outstanding (in shares) 2,626,099 2,626,099   4,814,434
Outstanding, weighted average exercise price (in dollars per share) $ 0.83 $ 0.83   $ 0.71
Vested or Expected to Vest (in shares) 1,951,533 1,951,533    
Vested or Expected to Vest, weighted average exercise price (in dollars per share) $ 1 $ 1    
Vested or Expected to Vest, weighted average remaining contractual life (Year)   2 years 197 days    
Vested or Expected to Vest, aggregate intrinsic value $ 536 $ 536    
Exercisable (in shares) 1,951,533 1,951,533    
Exercisable, weighted average exercise price (in dollars per share) $ 1 $ 1    
Exercisable, weighted average remaining contractual life (Year)   2 years 197 days    
Exercisable, aggregate intrinsic value $ 536 $ 536