Annual report pursuant to Section 13 and 15(d)

Credit Facility (Details)

v3.8.0.1
Credit Facility (Details) - Credit Facility - USD ($)
12 Months Ended
Nov. 15, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Credit Facility        
Maximum borrowing capacity $ 20,000,000      
Debt Service Coverage Ratio, minimum (as a percent) 2.00%      
Leverage Ratio, maximum (as a percent) 2.50%      
Collateral Coverage Ratio, minimum (as a percent) 1.50%      
Borrowings outstanding   $ 0    
Interest expense   $ 100,000 $ 0 $ 0
Index        
Credit Facility        
Interest rate margin (as a percent) 1.50%      
Interest rate   1.56%