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Income Taxes - General and Income Tax Expense (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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%    
Period of statute of limitations applicable to the entity's income tax returns     3 years    
Net operating losses          
NOLs expiration period     20 years    
Gross amount of NOLs available to company $ 13,041,000   $ 13,041,000   $ 13,041,000
Income Tax Expense          
Income Taxes Receivable 100,000   100,000    
Revised Texas Franchise Tax     277,000 $ 200,000  
Other Taxes     (112,000) 31,000  
Tax expense $ 113,000 $ 74,000 165,000 $ 231,000  
Deferred income taxes     $ 0