Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details)

v3.20.2
Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Outstanding at beginning of period (in shares) 238,470  
Outstanding at beginning of period, weighted average exercise price (in dollars per share) $ 17.38  
Outstanding, weighted average remaining contractual life (Year) 8 years 36 days 7 years 73 days
Granted (in shares) 295,000  
Granted, weighted average exercise price (in dollars per share) $ 2.29  
Exercised (in shares)  
Exercised, weighted average exercise price (in dollars per share)  
Canceled and Forfeited (in shares) (3,000)  
Canceled and Forfeited, weighted average exercise price (in dollars per share) $ 1.06  
Expired (in shares) (500)  
Expired, weighted average exercise price (in dollars per share) $ 30.80  
Outstanding at end of period (in shares) 529,970 238,470
Outstanding at end of period, weighted average exercise price (in dollars per share) $ 9.06 $ 17.38
Outstanding at end of period $ 314,880  
Exercisable at end of period (in shares) 114,870  
Exercisable at end of period, weighted average exercise price (in dollars per share) $ 25.20  
Exercisable at end of period, weighted average remaining contractual life (Year) 5 years 109 days  
Exercisable at end of period