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Note 17 - Stock Option and Purchase Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Outstanding (in shares) 2,326,250  
Outstanding, weighted average exercise price per share (in dollars per share) $ 1.47  
Granted (in shares) 706,000  
Granted, weighted average exercise price per share (in dollars per share) $ 1.06  
Exercised (in shares) 0 0
Exercised, weighted average exercise price per share (in dollars per share) $ 0  
Forfeited (in shares) (160,000)  
Forfeited, weighted average exercise price per share (in dollars per share) $ 1.48  
Expired (in shares) (304,500)  
Expired, weighted average exercise price per share (in dollars per share) $ 2.33  
Outstanding (in shares) 2,567,750 2,326,250
Outstanding, weighted average exercise price per share (in dollars per share) $ 1.26 $ 1.47
Outstanding, weighted average remaining term (Year) 2 years 113 days  
Outstanding, aggregate intrinsic value $ 0  
Exercisable (in shares) 1,010,500  
Exercisable, weighted average exercise price per share (in dollars per share) $ 1.21  
Exercisable, weighted average remaining term (Year) 149 days  
Exercisable, aggregate intrinsic value $ 0