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Income Taxes - General and Income Tax Expense (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 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
Income Tax Expense      
Income Taxes Receivable 100,000    
Revised Texas Franchise Tax 83,000 $ 70,000  
Other Taxes (112,000) 12,000  
Taxes on income (29,000) $ 82,000  
Deferred income taxes $ 0