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Equity Incentive Plans (Narrative) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2023
Jan. 31, 2023
Sep. 30, 2022
Jan. 12, 2022
Jun. 30, 2023
Jun. 30, 2022
Apr. 27, 2023
Defined Benefit Plan Disclosure [Line Items]              
Expected future expenses relating to non-vested restricted shares $ 813,000       $ 813,000    
Expected future compensation expense, weighted average period for recognition         2 years 11 months 4 days    
Stock option expense         $ 65,000 $ 88,000  
Restricted stock expense         $ 151,000 $ 54,000  
Options [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Shares underlying unexercised options 203,080       203,080    
Expected future compensation expense, unexercised options $ 331,000       $ 331,000    
Expected future compensation expense, weighted average period for recognition         3 years 3 months 25 days    
Options exercisable - number of option shares 772,895       772,895    
2023 Equity Incentive Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Shares authorized for issuance             1,000,000
Directors [Member] | Restricted Stock [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Restricted stock issued   27,000          
Vesting period   4 years          
Directors [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Restricted stock issued       33,000      
Vesting period       4 years      
Executive Officers [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Restricted stock issued     36,000        
Director And Officer [Member] | Restricted Stock [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Restricted stock issued 25,252