v3.19.3
Note 11 - Stock Options - Stock Options by Exercise Price Range (Details)
shares in Thousands
 9 Months Ended
Sep. 30, 2019
$ / shares
shares
Range of Exercise Price, upper (in dollars per share)
Options Outstanding, weighted average exercise price (in dollars per share) $ 23.38
Options Outstanding, number of options (in shares) | shares 731
Options Exercisable, weighted average exercise price (in dollars per share) $ 30.07
Options Exercisable, weighted average remaining life in years (Year) 5 years 292 days
Options exercisable, number of options exercisable (in shares) | shares 550
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 73 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) 2 years 328 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) 196.79
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 73 days
Options exercisable, number of options exercisable (in shares) | shares 399
Price Range 4 [Member]  
Range of Exercise Price, lower (in dollars per share) $ 21
Range of Exercise Price, upper (in dollars per share) 656.40
Options Outstanding, weighted average exercise price (in dollars per share) $ 370.21
Options Outstanding, number of options (in shares) | shares 41
Options Exercisable, weighted average exercise price (in dollars per share) $ 370.21
Options Exercisable, weighted average remaining life in years (Year) 255 days
Options exercisable, number of options exercisable (in shares) | shares 41