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Stock Repurchase Program (Details Textual) - USD ($)
9 Months Ended
May 22, 2018
Jan. 23, 2018
Jan. 24, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Equity Class Of Treasury Stock [Line Items]            
Common stock, shares outstanding       4,363,537   4,420,136
Common stock, shares authorized       20,000,000   20,000,000
Stock repurchase program, shares repurchased       70,181 9,563  
Stock Repurchase Program on January 24, 2017            
Equity Class Of Treasury Stock [Line Items]            
Percentage of shares authorized to be repurchased to common stock outstanding     2.30%      
Common stock, shares outstanding     4,420,055      
Stock repurchase program, remaining authorized amount       $ 5,600,000    
Stock repurchase program expiration date       Dec. 31, 2017    
Stock repurchase program, shares repurchased       12,863    
Stock Repurchase Program on January 24, 2017 | Maximum            
Equity Class Of Treasury Stock [Line Items]            
Shares authorized to be repurchased     100,000      
Stock Repurchase Program on January 23, 2018            
Equity Class Of Treasury Stock [Line Items]            
Shares authorized to be repurchased 200,000          
Percentage of shares authorized to be repurchased to common stock outstanding 5.30% 2.30%        
Common stock, shares outstanding   4,420,136        
Common stock, shares authorized 300,000          
Stock repurchase program, remaining authorized shares 231,512          
Stock repurchase program expiration date       Dec. 31, 2018    
Stock repurchase program, shares repurchased       68,488    
Stock Repurchase Program on January 23, 2018 | Maximum            
Equity Class Of Treasury Stock [Line Items]            
Shares authorized to be repurchased   100,000