Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v3.7.0.1
Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Mortgage principal payments   $ 103,603  
Mortgage [Member]      
Debt Instrument [Line Items]      
Interest rate 6.83%    
Maturity date Mar. 01, 2016    
Mortgage principal payments   $ 104,000  
Line of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity $ 15,000,000    
Line of credit, amount outstanding 0   $ 0
Line of credit, remaining borrowing capacity $ 10,943,000    
Line of credit facility, interest rate at period end 3.00%    
Line of credit, expiration date Aug. 12, 2021    
Minimum liquidity $ 10,000,000    
Line of Credit [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Line of credit, basis spread on variable rate 2.00%