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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 27, 2021
Aug. 10, 2009
Jan. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Initial Public Offering [Abstract]            
Initial public offering, issuance costs       $ 0 $ 135,405 $ 0
Preferred Stock [Abstract]            
Preferred stock, shares authorized       20,000,000    
Preferred stock, shares outstanding       0 0  
Common Stock [Abstract]            
Shelf Registration, sale of corporate securities (up to) $ 19,000,000   $ 100,000,000      
Common stock            
Initial Public Offering [Abstract]            
Initial public offering, effective date   Aug. 10, 2009        
Initial public offering, shares issued   5,000,000        
Initial public offering, price per share   $ 17.00        
Initial public offering, gross proceeds   $ 85,000,000        
Initial public offering, underwriting discounts   6,000,000        
Initial public offering, issuance costs   4,200,000        
Initial public offering, net proceeds   $ 74,800,000        
Common stock            
Common Stock [Abstract]            
Share-based compensation, shares       192,684 228,500 225,536