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Income Taxes - General and Income Tax Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal Income Tax Reporting      
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) 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      
Revised Texas Franchise tax rate (as a percent) 0.70%    
Revised Texas franchise tax $ 398,000 474,000 462,000
Other Taxes 35,000 24,000 18,000
Income tax expense 433,000 498,000 $ 480,000
Deferred income taxes 0    
Real estate assets net tax basis more (less) than book basis $ 161,606,000 $ 163,925,000