Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility (Details)

v3.8.0.1
Revolving Credit Facility (Details) - Revolving credit agreement - USD ($)
3 Months Ended
Jul. 11, 2017
Mar. 31, 2018
Dec. 31, 2017
Long-term debt      
Maximum borrowing capacity   $ 25,000,000  
Annual commitment fee   0.20%  
Long-term debt less current installments   $ 7,700,000 $ 13,200,000
LIBOR      
Long-term debt      
Margin on variable rate 1.25%    
Effective interest rate   3.13% 2.82%