Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details)

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Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details) - USD ($)
Sep. 30, 2017
Sep. 30, 2016
Dec. 03, 2014
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 186,476,000 $ 197,219,000  
Less current portion 4,550,000 4,493,000  
Long-term debt 181,926,000 192,726,000  
Deferred Financing Costs, Net 1,767,000 1,980,000  
Deferred Financing Costs, Net Current 0 0  
Deferred Financing Costs, Net 1,767,000 1,980,000  
Met Fixed-Rate Term Loans      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 99,062,000 105,312,000 $ 125,000,000
Deferred Financing Costs, Net 954,000 1,080,000  
Met Variable-Rate Term Loans      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 49,594,000 52,469,000 $ 57,500,000
Deferred Financing Costs, Net 439,000 497,000  
Met Citree Term Loan      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 5,000,000 5,000,000  
Deferred Financing Costs, Net 49,000 53,000  
Pru Loans A & B      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 23,030,000 24,190,000  
Deferred Financing Costs, Net 258,000 274,000  
Pru Loan E      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 4,895,000 5,115,000  
Deferred Financing Costs, Net 25,000 32,000  
Pru Loan F      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 4,895,000 5,115,000  
Deferred Financing Costs, Net 42,000 44,000  
John Deere equipment loan      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 0 18,000  
Deferred Financing Costs, Net $ 0 $ 0