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Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Income Taxes              
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS"     10.00%        
Maximum ownership of securities in all TRS (as a percent)     20.00%   25.00%    
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent)     25.00%        
Gross amount of NOL of TRS         $ 4,000,000.0 $ 4,400,000 $ 4,200,000
Net operating losses              
Gross amount of NOLs available to company $ 13,000,000.0   $ 13,000,000.0        
Income Tax Expense              
Income Taxes Receivable   $ 100,000   $ 100,000      
Revised Texas Franchise Tax     132,000 164,000      
Other Taxes       (112,000)      
Tax expense $ 64,000 $ 81,000 132,000 $ 52,000      
Deferred income taxes     $ 0