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Stock-Based Compensation (Detail Textuals) - Unrestricted Stock Grants - 2001 Nonqualified Stock Plan - Directors, officers and employees - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2015
Jul. 01, 2014
Mar. 26, 2015
Jan. 31, 2015
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
2014 Grant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares granted (in shares)         152,000      
Stock-based compensation expense               $ 876,000
Number of shares issued (in shares)   58,769   56,804        
Number of common stock shares surrendered by employees withholding taxes   17,231   19,196        
Common stock value surrendered by employees withholding taxes   $ 113,000   $ 87,000        
2015 Grant                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares granted (in shares)     152,000          
Number of shares issuable in future     76,000          
Stock-based compensation expense             $ 682,000  
Stock based compensation expense charged           $ 221,000 236,000  
Remaining stock based compensation expense           $ 446,000 $ 446,000  
2015 Grant | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares issued (in shares) 76,000