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Long-Term Debt (Details) - USD ($)
Dec. 05, 2016
May 26, 2016
Sep. 22, 2006
Sep. 30, 2017
Dec. 31, 2016
Apr. 29, 2016
Debt Instrument [Line Items]            
Notes Payable       $ 53,119,000 $ 54,175,000  
Florida State Board of Administration Note Payable            
Debt Instrument [Line Items]            
Notes Payable     $ 20,000,000      
Debt Instrument, Term     20 years      
Interboro, LLC Promissory Note            
Debt Instrument [Line Items]            
Notes Payable           $ 8,550,000
BB&T Term Note Payable            
Debt Instrument [Line Items]            
Notes Payable   $ 5,200,000        
Basis spread on variable rate   1.65%        
Debt Instrument, Term   15 years        
Senior Notes            
Debt Instrument [Line Items]            
Notes Payable $ 30,000,000          
Basis spread on variable rate 5.75%          
Debt Instrument, Term 10 years