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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 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        
Income Tax Expense          
Income Taxes Receivable 100,000        
Revised Texas Franchise Tax 68,000 $ 83,000      
Other Taxes   (112,000)      
Tax expense 68,000 $ (29,000)      
Deferred income taxes $ 0