Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Schedule of Outstanding Debt) (Details)

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Long-Term Debt (Schedule of Outstanding Debt) (Details) - USD ($)
 9 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Debt Instrument [Line Items]        
Total $ 206,580,000   $ 61,640,000  
Long-term debt, current portion 4,511,000   3,196,000  
Long-term debt, net of current portion 202,069,000   $ 58,444,000  
Metropolitan Life Insurance Company and New England Life Insurance Company fixed rate term loans in the original principal amount of $125 million [Member]        
Debt Instrument [Line Items]        
Total 113,125,000      
Principal amount of debt $ 125,000,000      
Fixed interest rate 4.15%      
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57.5 million [Member]        
Debt Instrument [Line Items]        
Total $ 56,063,000      
Principal amount of debt $ 57,500,000      
Effective interest rate 1.78%      
Metropolitan Life Insurance Company term loan [Member]        
Debt Instrument [Line Items]        
Total $ 500,000      
Fixed interest rate 5.49%      
Amount of future advance $ 4,500,000      
Rabo Agrifinance, Inc. variable rate term loan [Member]        
Debt Instrument [Line Items]        
Total     $ 34,000,000  
Effective interest rate 2.40%      
Prudential Mortgage Capital Company, LLC fixed rate term loans (5.35%) [Member]        
Debt Instrument [Line Items]        
Total $ 25,930,000 $ 25,930,000 $ 27,550,000 $ 27,550,000
Fixed interest rate 5.35%      
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.85%) [Member]        
Debt Instrument [Line Items]        
Total $ 5,445,000 $ 5,445,000    
Fixed interest rate 3.85% 3.85%    
Prudential Mortgage Capital Company, LLC fixed rate term loan (3.45%) [Member]        
Debt Instrument [Line Items]        
Total $ 5,445,000 $ 5,445,000    
Fixed interest rate 3.45% 3.45%    
Note Payable to Financing Company [Member]        
Debt Instrument [Line Items]        
Total $ 72,000   $ 90,000