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Accounting Policies and Basis of Presentation - Debt (Details)
Mar. 21, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]      
Unamortized loan fees   $ 667,000 $ 636,000
Outstanding borrowings under credit facility   39,538,000  
Credit facility, remaining borrowing capacity   $ 47,385,000  
Average interest rate (as a percent)   2.52%  
Revolver borrowings [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility   $ 19,285,000  
Fixed asset sub-line term loan [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility   5,753,000  
Second Amended and Restated Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 80,000,000    
Covenant compliance, maximum individual acquisition allowable (less than) 1,000,000    
Covenant compliance, maximum aggregate acquisitions allowable 7,500,000    
Loan fees incurred during period   46,000  
Unamortized loan fees   667,000  
Third Amended and Restated Agreement [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 95,000,000    
Periodic payment, principal 250,000    
Covenant compliance, maximum aggregate acquisitions allowable $ 35,000,000    
Covenant compliance, fixed charge coverage ratio excess availability (as a percent) (less than) 17.50%    
Minimum [Member] | Second Amended and Restated Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Covenant compliance, fixed charge coverage ratio 1.10    
Minimum [Member] | Third Amended and Restated Agreement [Member]      
Line of Credit Facility [Line Items]      
Covenant compliance, fixed charge coverage ratio 1.25    
Term Loan [Member] | Third Amended and Restated Agreement [Member]      
Line of Credit Facility [Line Items]      
Long-term debt $ 15,000,000 $ 14,500,000