Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Employee and Director Benefits - Summary of Stock Option Activity (Details)

v3.21.1
Note 7 - Employee and Director Benefits - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Granted (in shares)   0    
Share-based Payment Arrangement, Option [Member]        
Outstanding, shares (in shares) 640,950 965,248 965,248  
Outstanding, weighted average exercise price (in dollars per share) $ 18.14 $ 15.19 $ 15.19  
Outstanding, weighted average remaining contractual term (Year) 4 years 7 months 6 days 5 years 4 months 24 days 4 years 7 months 6 days 4 years 10 months 24 days
Outstanding, aggregate intrinsic value $ 14,859 $ 12,969 $ 16,981 $ 21,911
Granted (in shares) 500 0    
Granted, weighted average exercise price (in dollars per share) $ 32.60 $ 0    
Granted, weighted average remaining contractual term (Year) 8 years 2 months 12 days      
Granted, aggregate intrinsic value $ 14 $ 0    
Exercised (in shares) (187,500) (216,000)    
Exercised, weighted average exercise price (in dollars per share) $ 9.92 $ 10.47    
Exercised, weighted average remaining contractual term (Year) 3 years 3 months 18 days 3 years 3 months 18 days    
Exercised, aggregate intrinsic value $ 9,639 $ 4,072    
Forfeited (in shares) (6,000) (18,000)    
Forfeited, weighted average exercise price (in dollars per share) $ 5.82 $ 30.79    
Forfeited, weighted average remaining contractual term (Year) 9 months 18 days 6 years 10 months 24 days    
Forfeited, aggregate intrinsic value $ 79 $ 26    
Exercisable, shares (in shares) 329,700 210,500    
Exercisable, weighted average exercise price (in dollars per share) $ 13.57 $ 16.54    
Exercisable, weighted average remaining contractual term (Year) 3 years 8 months 12 days 5 years    
Exercisable, aggregate intrinsic value $ 15,962 $ 7,146    
Outstanding, shares (in shares) 447,950 731,248 640,950 965,248
Outstanding, weighted average exercise price (in dollars per share) $ 19.64 $ 17.68 $ 18.14 $ 15.19