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Stock Repurchase Program (Details Textual) - USD ($)
6 Months Ended
May 22, 2018
Jan. 23, 2018
Jan. 24, 2017
Jun. 30, 2018
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  
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