Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility (Details)

v3.7.0.1
Revolving Credit Facility (Details) - Revolving credit agreement - USD ($)
 6 Months Ended
Jul. 11, 2017
Jun. 30, 2017
Dec. 31, 2016
Wells Fargo Credit Agreement      
Long-term debt      
Maximum borrowing capacity   $ 25,000,000  
Annual commitment fee   0.25%  
Long-term debt less current installments   $ 12,000,000 $ 9,900,000
Bank of America Credit Agreement | Subsequent Event      
Long-term debt      
Maximum borrowing capacity $ 25,000,000.0    
Margin on variable rate 1.25%    
Annual commitment fee 0.20%    
LIBOR | Wells Fargo Credit Agreement      
Long-term debt      
Margin on variable rate   1.25%  
Effective interest rate   2.50% 2.13%