Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details)

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Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Assets    
Total assets at fair value $ 4,347,513 $ 42,433,710
Level 1    
Assets    
Total assets at fair value 4,347,513 7,809,137
Level 3    
Assets    
Total assets at fair value   34,624,573
Investments in securities    
Assets    
Total assets at fair value 4,347,513  
Investments in securities | Level 1    
Assets    
Total assets at fair value $ 4,347,513  
Self storage facilities | Wholly Owned Subsidiaries    
Assets    
Total assets at fair value   34,600,000
Self storage facilities | Level 3 | Wholly Owned Subsidiaries    
Assets    
Total assets at fair value   34,600,000
Other | Wholly Owned Subsidiaries    
Assets    
Total assets at fair value   24,573
Other | Level 3 | Wholly Owned Subsidiaries    
Assets    
Total assets at fair value   24,573
Common Stocks    
Assets    
Total assets at fair value   3,106,050
Common Stocks | Level 1    
Assets    
Total assets at fair value   3,106,050
Preferred Stocks    
Assets    
Total assets at fair value   1,176,750
Preferred Stocks | Level 1    
Assets    
Total assets at fair value   1,176,750
Short-term Investments    
Assets    
Total assets at fair value   3,526,337
Short-term Investments | Level 1    
Assets    
Total assets at fair value   $ 3,526,337