Annual report pursuant to Section 13 and 15(d)

Credit Facility (Details)

v3.6.0.2
Credit Facility (Details) - Credit Facility
12 Months Ended
Jan. 04, 2013
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Credit Facility        
Maximum borrowing capacity $ 10,000,000      
Number of payments | item 1      
Total liabilities to tangible net worth ratio, maximum 2.50      
Interest coverage ratio, minimum 2.00      
Borrowings outstanding   $ 0    
Interest expense   $ 0 $ 0 $ 0
Index        
Credit Facility        
Variable interest rate base LIBOR      
Interest rate margin (as a percent) 1.50%