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Debt Obligations - Credit Facility (Details) - USD ($)
3 Months Ended 6 Months Ended
May 02, 2019
Apr. 18, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]          
Debt assumed, face value     $ 65,597,000 $ 65,597,000  
Proceeds from credit facility       9,000,000 $ 0
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt          
Debt Instrument [Line Items]          
Debt assumed, face value   $ 10,000,000      
Effective interest rate 6.00%        
Unused borrowing capacity fee, percentage   0.25%      
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Trussville, AL          
Debt Instrument [Line Items]          
Proceeds from credit facility $ 9,000,000        
Interest expense     $ 96,000 $ 96,000  
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Prime Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Line of Credit | Valley National Bank | Credit Facility, Maturing April 2021 | Secured Debt | Floor          
Debt Instrument [Line Items]          
Basis spread on variable rate   5.00%