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Subsequent Events (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 05, 2015
Feb. 29, 2020
Sep. 30, 2019
Dec. 31, 2019
Nov. 04, 2019
Nov. 08, 2018
Nov. 30, 2015
Debt Instrument [Line Items]              
Credit line capacity       $ 97,756,000      
Line of Credit | Unsecured Debt              
Debt Instrument [Line Items]              
Credit line capacity           $ 60,000,000  
Interest rate of notes payable           10.00%  
Line of Credit | Unsecured Debt | Subsequent Event              
Debt Instrument [Line Items]              
Credit line capacity   $ 100,000,000          
Interest rate of notes payable   11.00%          
New Credit Agreement | Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Credit line capacity $ 75,000,000.0       $ 75,000,000   $ 100,000,000
Commitment fee percentage 0.25%            
New Credit Agreement | Revolving Credit Facility | Line of Credit | Subsequent Event              
Debt Instrument [Line Items]              
Commitment fee percentage   0.25%          
Minimum              
Debt Instrument [Line Items]              
Total revolving commitment, minimum consecutive days     30 days 30 days      
Maximum              
Debt Instrument [Line Items]              
Total revolving commitment (as a percent)     10.00% 10.00%