Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.7.0.1
Debt (Details) - Revolving Credit Facility
 3 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 25, 2014
USD ($)
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 170,000,000.0
Remaining borrowing capacity $ 144,149,393 $ 146,181,002  
Maximum leverage ratio 4.0    
Debt covenant, minimum availability required $ 10,000,000    
London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Increments of debt that can be converted $ 500,000    
Maximum | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 3.00%    
Minimum      
Line of Credit Facility [Line Items]      
Interest coverage rate 3.0    
Minimum | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.50%