Quarterly report pursuant to Section 13 or 15(d)

Credit Facility (Details)

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Credit Facility (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2017
USD ($)
item
Jan. 04, 2013
USD ($)
Credit Facility      
Borrowings outstanding $ 2,000,000 $ 2,000,000  
Credit Facility      
Credit Facility      
Maximum borrowing capacity     $ 10,000,000
Number of payments | item 1 1  
Total liabilities to tangible net worth ratio, maximum 2.50 2.50  
Interest coverage ratio, minimum 2.00 2.00  
Borrowings outstanding $ 2,000,000 $ 2,000,000  
Interest expense   $ 100,000  
Average interest rate during period 2.74%    
Credit Facility | Index      
Credit Facility      
Interest rate margin (as a percent)   1.50%  
Variable interest rate base   LIBOR