Annual report pursuant to Section 13 and 15(d)

Note 6 - Stock-based Compensation - Summary of Stock Option Activity (Details)

v3.20.1
Note 6 - Stock-based Compensation - Summary of Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Outstanding, beginning of period (in shares) | shares 157,915
Outstanding at beginning of year, weighted average exercise price (in dollars per share) | $ / shares $ 24.82
Granted (in shares) | shares 95,250
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 5.89
Canceled and forfeited (in shares) | shares (5,304)
Canceled and Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 8.94
Expired (in shares) | shares (9,391)
Expired (in dollars per share) | $ / shares $ 30.87
Outstanding, end of period (in shares) | shares 238,470
Outstanding at beginning of year, weighted average exercise price (in dollars per share) | $ / shares $ 17.38
Outstanding (Year) 7 years 73 days
Outstanding at end of year, aggregate intrinsic value | $
Exercisable (in shares) | shares 84,807
Exercisable at end of year, weighted average exercise price (in dollars per share) | $ / shares $ 31.77
Exercisable at end of year, weighted average remaining contractual life (Year) 5 years
Exercisable at end of year, aggregate intrinsic value | $