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Note 8 - Stock Options - Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of outstanding options (in thousands) (in shares) [1] 970  
Number of outstanding options (in thousands) (in shares) 917 1,172
Weighted average remaining contractual life (Year) [1] 3 years 14 days  
Weighted average remaining contractual life (Year) 2 years 259 days  
Weighted average exercise price per share (in dollars per share) [1] $ 0.95  
Weighted average exercise price per share (in dollars per share) $ 0.84 $ 0.84
Intrinsic value (in thousands) [1] $ 4,411  
Intrinsic value (in thousands) $ 4,278  
[1] Includes effects of expected forfeitures