Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Summary of Stock Options - Summary of Options Outstanding and Exercisable (Details)

v3.20.1
Note 11 - Summary of Stock Options - Summary of Options Outstanding and Exercisable (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Options outstanding, number (in shares) | shares 10,432,654
Options outstanding, weighted average exercise price (in dollars per share) $ 1.95
Options outstanding, weighted average remaining contractual term (Year) 9 years 255 days
Options exercisable, number exercisable (in shares) | shares 833,785
Options exercisable, weighted average exercise price (in dollars per share) $ 9.63
Range One [Member]  
Exercise price range, lower limit (in dollars per share) 0.69
Exercise price range, upper limit (in dollars per share) $ 0.89
Options outstanding, number (in shares) | shares 10,238,979
Options outstanding, weighted average exercise price (in dollars per share) $ 0.86
Options outstanding, weighted average remaining contractual term (Year) 9 years 255 days
Options exercisable, number exercisable (in shares) | shares 813,153
Options exercisable, weighted average exercise price (in dollars per share) $ 0.87
Range Two [Member]  
Exercise price range, lower limit (in dollars per share) 1.09
Exercise price range, upper limit (in dollars per share) $ 1.36
Options outstanding, number (in shares) | shares 155,000
Options outstanding, weighted average exercise price (in dollars per share) $ 1.26
Options outstanding, weighted average remaining contractual term (Year) 9 years 328 days
Options exercisable, number exercisable (in shares) | shares
Options exercisable, weighted average exercise price (in dollars per share)
Range Three [Member]  
Exercise price range, lower limit (in dollars per share) 38
Exercise price range, upper limit (in dollars per share) $ 58
Options outstanding, number (in shares) | shares 1,600
Options outstanding, weighted average exercise price (in dollars per share) $ 55.81
Options outstanding, weighted average remaining contractual term (Year) 9 years 73 days
Options exercisable, number exercisable (in shares) | shares
Options exercisable, weighted average exercise price (in dollars per share)
Range Four [Member]  
Exercise price range, lower limit (in dollars per share) 100
Exercise price range, upper limit (in dollars per share) $ 197
Options outstanding, number (in shares) | shares 20,352
Options outstanding, weighted average exercise price (in dollars per share) $ 141.85
Options outstanding, weighted average remaining contractual term (Year) 8 years 219 days
Options exercisable, number exercisable (in shares) | shares 9,174
Options exercisable, weighted average exercise price (in dollars per share) $ 147.74
Range Five [Member]  
Exercise price range, lower limit (in dollars per share) 202
Exercise price range, upper limit (in dollars per share) $ 283
Options outstanding, number (in shares) | shares 743
Options outstanding, weighted average exercise price (in dollars per share) $ 251.21
Options outstanding, weighted average remaining contractual term (Year) 7 years 219 days
Options exercisable, number exercisable (in shares) | shares 392
Options exercisable, weighted average exercise price (in dollars per share) $ 254.90
Range Six [Member]  
Exercise price range, lower limit (in dollars per share) 311
Exercise price range, upper limit (in dollars per share) $ 382
Options outstanding, number (in shares) | shares 2,625
Options outstanding, weighted average exercise price (in dollars per share) $ 344.68
Options outstanding, weighted average remaining contractual term (Year) 8 years 146 days
Options exercisable, number exercisable (in shares) | shares 1,238
Options exercisable, weighted average exercise price (in dollars per share) $ 345.28
Range Seven [Member]  
Exercise price range, lower limit (in dollars per share) 430
Exercise price range, upper limit (in dollars per share) $ 497
Options outstanding, number (in shares) | shares 6,707
Options outstanding, weighted average exercise price (in dollars per share) $ 454.33
Options outstanding, weighted average remaining contractual term (Year) 7 years 109 days
Options exercisable, number exercisable (in shares) | shares 4,281
Options exercisable, weighted average exercise price (in dollars per share) $ 455.78
Range Eight [Member]  
Exercise price range, lower limit (in dollars per share) 501
Exercise price range, upper limit (in dollars per share) $ 567
Options outstanding, number (in shares) | shares 3,215
Options outstanding, weighted average exercise price (in dollars per share) $ 537.49
Options outstanding, weighted average remaining contractual term (Year) 7 years 36 days
Options exercisable, number exercisable (in shares) | shares 2,432
Options exercisable, weighted average exercise price (in dollars per share) $ 536.76
Range Nine [Member]  
Exercise price range, lower limit (in dollars per share) 600
Exercise price range, upper limit (in dollars per share) $ 661
Options outstanding, number (in shares) | shares 1,392
Options outstanding, weighted average exercise price (in dollars per share) $ 602.19
Options outstanding, weighted average remaining contractual term (Year) 5 years 292 days
Options exercisable, number exercisable (in shares) | shares 1,375
Options exercisable, weighted average exercise price (in dollars per share) $ 601.46
Range Ten [Member]  
Exercise price range, lower limit (in dollars per share) 700
Exercise price range, upper limit (in dollars per share) $ 792
Options outstanding, number (in shares) | shares 1,937
Options outstanding, weighted average exercise price (in dollars per share) $ 767.72
Options outstanding, weighted average remaining contractual term (Year) 6 years 219 days
Options exercisable, number exercisable (in shares) | shares 1,636
Options exercisable, weighted average exercise price (in dollars per share) $ 767.47
Range Eleven [Member]  
Exercise price range, lower limit (in dollars per share) 992
Exercise price range, upper limit (in dollars per share) $ 992
Options outstanding, number (in shares) | shares 104
Options outstanding, weighted average exercise price (in dollars per share) $ 992
Options outstanding, weighted average remaining contractual term (Year) 2 years 292 days
Options exercisable, number exercisable (in shares) | shares 104
Options exercisable, weighted average exercise price (in dollars per share) $ 992