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Equity Incentive Plan (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 18, 2018
Aug. 16, 2018
Sep. 18, 2018
Aug. 16, 2018
Mar. 31, 2020
Dec. 31, 2018
Aug. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized under equity incentive plan             231,437
Management and staff              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of expiration period 10 years            
Exercise price of each option $ 12.45            
Management and staff | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period 7 years            
Management and staff | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period 5 years            
Members of Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period   5 years          
Term of expiration period   10 years          
Exercise price of each option   $ 12.48          
Restricted Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares granted         0    
Unrecognized compensation expense under restricted stock award         $ 582,000    
Amount of recognized of share based compensation expense         $ 39,000    
Restricted Stock Awards | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period         7 years    
Restricted Stock Awards | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period         5 years    
Restricted Stock Awards | Management and staff              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares granted 49,581            
Restricted Stock Awards | Members of Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares granted   16,530          
Stock option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized under equity incentive plan             165,312
Number of stock options granted            
Exercise price of each option            
Unrecognized compensation expense under stock options         $ 384,000    
Amount of recognized of share based compensation expense         $ 26,000    
Amount of granted fair value           $ 544,000  
Number of stock options exercisable         27,537    
Fair value of number of share granted     $ 3.75 $ 3.69      
Stock option | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period         7 years    
Stock option | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of award vesting period         5 years    
Stock option | Management and staff              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of stock options granted 104,500            
Stock option | Members of Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of stock options granted   41,325          
Restricted stock awards, restricted stock units and unrestricted share awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized under equity incentive plan             66,125