v3.19.3
Note 10 - Stock Options - Stock Options by Exercise Price Range (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Options Outstanding, weighted average exercise price (in dollars per share) $ 24.95
Options Outstanding, number of options (in shares) | shares 748
Options Exercisable, weighted average exercise price (in dollars per share) $ 24.95
Options Exercisable, weighted average remaining life in years (Year) 5 years 255 days
Options exercisable, number of options exercisable (in shares) | shares 530
Price Range 1 [Member]  
Range of Exercise Price, lower (in dollars per share) $ 1.11
Range of Exercise Price, upper (in dollars per share) 1.38
Options Outstanding, weighted average exercise price (in dollars per share) $ 1.11
Options Outstanding, number of options (in shares) | shares 73
Options Exercisable, weighted average exercise price (in dollars per share) $ 1.11
Options Exercisable, weighted average remaining life in years (Year) 2 years 182 days
Options exercisable, number of options exercisable (in shares) | shares 73
Price Range 2 [Member]  
Range of Exercise Price, lower (in dollars per share) $ 1.39
Range of Exercise Price, upper (in dollars per share) 3.05
Options Outstanding, weighted average exercise price (in dollars per share) $ 1.39
Options Outstanding, number of options (in shares) | shares 37
Options Exercisable, weighted average exercise price (in dollars per share) $ 1.39
Options Exercisable, weighted average remaining life in years (Year) 3 years 73 days
Options exercisable, number of options exercisable (in shares) | shares 37
Price Range 3 [Member]  
Range of Exercise Price, lower (in dollars per share) $ 3.06
Range of Exercise Price, upper (in dollars per share) 20.99
Options Outstanding, weighted average exercise price (in dollars per share) $ 3.06
Options Outstanding, number of options (in shares) | shares 580
Options Exercisable, weighted average exercise price (in dollars per share) $ 3.06
Options Exercisable, weighted average remaining life in years (Year) 7 years 182 days
Options exercisable, number of options exercisable (in shares) | shares 362
Price Range 4 [Member]  
Range of Exercise Price, lower (in dollars per share) $ 21.00
Range of Exercise Price, upper (in dollars per share) 656.40
Options Outstanding, weighted average exercise price (in dollars per share) $ 289.81
Options Outstanding, number of options (in shares) | shares 58
Options Exercisable, weighted average exercise price (in dollars per share) $ 289.81
Options Exercisable, weighted average remaining life in years (Year) 255 days
Options exercisable, number of options exercisable (in shares) | shares 58