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Equity Incentive Plans (Narrative) (Details) - USD ($)
 3 Months Ended
Feb. 19, 2021
Feb. 10, 2021
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Options granted     66,000
Shares underlying unexercised options     426,812  
Expected future compensation expense, unexercised options     $ 713,000  
Options [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Expected future compensation expense, weighted average period for recognition     4 years 11 months 26 days  
Restricted Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Expected future expenses relating to non-vested restricted shares     $ 361,000  
Expected future compensation expense, weighted average period for recognition     3 years 3 months 10 days  
2018 Equity Incentive Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Shares authorized for issuance     1,000,000  
2011 Stock Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Shares authorized for issuance     900,000  
Directors [Member] | 2018 Equity Incentive Plan [Member] | Options [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Options granted   66,000    
Vesting period   5 years    
Directors [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Restricted stock issued 300 26,400    
Vesting period 2 years 4 years