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Long-Term Debt (Details) (USD $)
 1 Months Ended 9 Months Ended
Jan. 31, 2012
Sep. 30, 2012
acre
Dec. 31, 2011
Long-Term Debt      
Long-term debt   $ 47,568,000 $ 45,521,000
Less current portion   47,568,000  
Long-term debt     45,521,000
Minimum
      
Long-Term Debt      
Required liquidity under financial covenants   4,000,000  
Maximum
      
Long-Term Debt      
Required total liabilities under financial covenants   175,000,000  
Wells Fargo revolving loans
      
Long-Term Debt      
Long-term debt   23,500,000 21,100,000
Interest rate (as a percent)   4.05% 4.12%
Maximum borrowing capacity   34,500,000  
Variable rate basis   LIBOR  
Interest rate margin (as a percent)   3.80%  
Area of the company's real estate pledged as collateral (in acres)   880  
Available borrowing capacity   10,500,000  
Irrevocable letters of credit   500,000  
Wells Fargo revolving loans | Minimum
      
Long-Term Debt      
Required liquidity under financial covenants   4,000,000  
Operating income attributable to properties as a percentage of aggregate amount to extend maturity date   6.00%  
Wells Fargo revolving loans | Maximum
      
Long-Term Debt      
Required total liabilities under financial covenants   175,000,000  
Aggregate amount of credit line as a percentage of value of property to extend maturity date   40.00%  
American AgCredit term loan, 5.25%
      
Long-Term Debt      
Long-term debt   24,068,000 24,421,000
Interest rate (as a percent)   5.25% 5.25%
Variable rate basis   30-day LIBOR  
Interest rate margin (as a percent)   4.25%  
Area of the company's real estate pledged as collateral (in acres)   3,100  
Interest rate, variable interest rate floor (as a percent)   1.00%  
Applicable spread after tiered reduction (as a percent)   0.0375  
Mandatory principal prepayment as percentage of the net proceeds of the sale of any real property pledged as collateral   100.00%  
Repayment of principal 353,000    
American AgCredit term loan, 5.25% | Minimum
      
Long-Term Debt      
Required liquidity under financial covenants   4,000,000  
Mandatory principal prepayment as percentage of the net proceeds of the sale of non collateralized real property   10.00%  
American AgCredit term loan, 5.25% | Maximum
      
Long-Term Debt      
Required total liabilities under financial covenants   $ 175,000,000  
Mandatory principal prepayment as percentage of the net proceeds of the sale of non collateralized real property   75.00%