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Equity Incentive Plans (Summary of Stock Option Activity) (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Equity Incentive Plans [Abstract]        
Outstanding, Beginning Balance - Number of Options 1,192,348 1,200,975 1,200,975  
Options Granted - Number of Options 66,000    
Options Exercised - Number of Options (7,000) (500)    
Options Forfeited - Number of Options      
Options Expired - Number of Options      
Outstanding, Ending Balance - Number of Options 1,251,348 1,200,475 1,192,348 1,200,975
Outstanding, Range of Exercise Price, Lower Range Limit (per share) $ 8.93 $ 8.93 $ 8.93 $ 8.93
Outstanding, Range of Exercise Price, Upper Range Limit (per share) 13.32 13.32 13.32 13.32
Options Granted, Exercise Price 12.93      
Options Exercised - Exercise Price 9.39 10.55    
Outstanding Number of Options, Beginning Balance - Weighted Average Exercise Price 11.45 11.45 11.45  
Number of Options Granted - Weighted Average Exercise Price 12.93      
Number of Options, Exercised - Weighted Average Exercise Price 9.39 10.55    
Outstanding Number of Options, Ending Balance - Weighted Average Exercise Price $ 11.54 $ 11.45 $ 11.45 $ 11.45
Exercisable - Number of Options 824,536 515,800