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Shareholders' Equity (Detail Textuals 1) - Restricted stock - USD ($)
1 Months Ended 12 Months Ended
Jan. 02, 2017
Apr. 11, 2016
Apr. 18, 2013
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Number of restricted stock shares vested       54,750 41,250
2012 Long-Term Incentive Plan          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Number of shares authorized for issuance       300,000  
Compensation expense not yet recognized       $ 0  
2012 Long-Term Incentive Plan | Executive Officers          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Number of restricted stock issued   51,000 165,000    
Number of shares authorized for issuance     300,000    
Vesting period of restricted share awards     4 years    
Expense recognized for issuance of restricted shares       $ 213,000 $ 494,000
Compensation expense not yet recognized   $ 406,000 $ 1,336,500    
Compensation expenses, recognition period     4 years    
Number of restricted stock shares vested 39,750        
Number of shares withheld and repurchased and added to treasury 15,991        
Value of shares withheld and repurchased and added to treasury $ 159,000