Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Lines of Credit - Schedule of Lines of Credit (Details)

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Long-Term Debt and Lines of Credit - Schedule of Lines of Credit (Details) - USD ($)
Mar. 31, 2016
Sep. 30, 2015
Dec. 03, 2014
Line of Credit Facility [Line Items]      
Lines of Credit $ 5,000,000 $ 0  
Metropolitan Life Insurance Company and New England Life Insurance Company revolving line of credit: this $25,000,000 line bears interest at a variable rate which was 2.12% per annum as of March 31, 2016. The line is collateralized by real estate and matures in November 2019. Availability under the line was $20,000,000 as of March 31, 2016.      
Line of Credit Facility [Line Items]      
Lines of Credit 5,000,000 0  
Revolving line of credit 25,000,000   $ 25,000,000
Availability under line of credit $ 20,000,000    
Interest rate 2.12%    
Rabo Agrifinance, Inc. working capital line of credit: this $70,000,000 line bears interest at a variable rate which was 2.19% per annum as of March 31, 2016. The line is collateralized by current assets and certain personal property and matures in November 2016. Availability under the line was approximately $56,000,000 as of March 31, 2016.      
Line of Credit Facility [Line Items]      
Lines of Credit $ 0 $ 0  
Revolving line of credit 70,000,000   $ 70,000,000
Availability under line of credit $ 56,000,000    
Interest rate 2.19%