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Debt (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Long-term debt maturities    
2014 $ 290,000  
2015 314,000  
2016 340,000  
2017 368,000  
2018 398,000  
Thereafter 427,000  
Total long-term debt 2,137,000  
Less current portion 290,000 268,000
Long-term debt, net of current portion 1,847,000 2,138,000
Mortgage Payable
   
Debt    
Land and buildings 4,700,000 4,800,000
Principal balance 2,100,000 2,400,000
Annual interest rate accrued on mortgage (as a percent) 7.91% 7.91%
Fair value of debt instrument $ 2,300,000 $ 2,600,000