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Equity Incentive Plan (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 18, 2018
Aug. 16, 2018
Sep. 18, 2018
Aug. 16, 2018
Sep. 30, 2019
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]            
Unrecognized compensation expense under restricted stock award         $ 660,000  
Amount of recognized of share based compensation expense         $ 116,000  
Number of restricted shares granted         0  
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
Exercise price of each option         $ 0.00  
Unrecognized compensation expense under stock options         $ 435,000  
Amount of recognized of share based compensation expense         77,000  
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    
Number of stock options granted         0  
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