Current report filing

Note 5 - Stock-based Compensation - Summary of Stock Option Activity (Details)

v3.8.0.1
Note 5 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Outstanding at beginning of year (in shares) 5,437,064    
Outstanding at beginning of period, weighted average exercise price (in dollars per share) $ 1.96    
Granted (in shares) 479,457    
Granted, weighted average exercise price (in dollars per share) $ 1.05    
Exercised (in shares) (50,000) (146,625) (468,000)
Exercised, weighted average exercise price (in dollars per share) $ 0.27    
Canceled and forfeited (in shares) (2,186,906)    
Canceled and Forfeited, weighted average exercise price (in dollars per share) $ 1.69    
Expired (in shares) (299,000)    
Expired, weighted average exercise price (in dollars per share) $ 2.42    
Outstanding at end of year (in shares) 3,380,615 5,437,064  
Outstanding at end of period, weighted average exercise price (in dollars per share) $ 2 $ 1.96  
Outstanding at end of period, weighted average remaining contractual life (Year) 6 years 182 days    
Outstanding at end of year $ 16,013    
Exercisable at end of year (in shares) 2,548,681    
Exercisable at end of period, weighted average exercise price (in dollars per share) $ 2.07    
Exercisable at end of period, weighted average remaining contractual life (Year) 6 years 36 days    
Exercisable at end of year $ 16,013