Annual report pursuant to Section 13 and 15(d)

Long-term Debt (Line of Credit) (Details)

v3.6.0.2
Long-term Debt (Line of Credit) (Details) - Revolving Line of Credit [Member] - USD ($)
 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Jan. 03, 2015
Nov. 21, 2014
Line of Credit Facility [Line Items]          
Line of credit, maximum borrowing capacity         $ 40,000,000
Line of credit, average outstanding amount   $ 6,830,000 $ 6,446,000 $ 2,735,000  
Line of credit, weighted average interest rate (percent)   2.88% 2.48% 1.35%  
Interest payments   $ 826,000 $ 1,149,000 $ 930,000  
Revolving line of credit due November 21, 2017 [Member]          
Line of Credit Facility [Line Items]          
Line of credit, maximum borrowing capacity         40,000,000
Line of credit, increase to limit         $ 15,000,000
Variable rate basis     LIBOR    
Stated interest rate (percent)     2.00% 1.77%  
Unused capacity fee on line of credit (percent)     0.125% 0.125%  
ABL line of credit, due February 28, 2019 [Member]          
Line of Credit Facility [Line Items]          
Line of credit, maximum borrowing capacity $ 45,000,000 $ 30,466,000      
Variable rate basis LIBOR        
Stated interest rate (percent)   2.62%      
Unused capacity fee on line of credit (percent)   0.125%      
Line of credit, amount borrowed   $ 8,804,206      
Line of credit, remaining availability   $ 21,662,000