Quarterly report pursuant to Section 13 or 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 ($)
Dec. 31, 2017
Sep. 30, 2017
Dec. 03, 2014
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 185,358,000 $ 186,476,000  
Less current portion 4,575,000 4,550,000  
Deferred Financing Costs, Net 1,715,000 1,767,000  
Less current portion of deferred financing costs 0 0  
Long-term debt 180,783,000 181,926,000  
Deferred financing costs 1,715,000 1,767,000  
Met Fixed-Rate Term Loans      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 99,062,000 99,062,000 $ 125,000,000
Deferred Financing Costs, Net 924,000 954,000  
Met Variable-Rate Term Loans      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 48,876,000 49,594,000 $ 57,500,000
Deferred Financing Costs, Net 425,000 439,000  
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 48,000 49,000  
Pru Loans A & B      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 22,740,000 23,030,000  
Deferred Financing Costs, Net 253,000 258,000  
Pru Loan E      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 4,840,000 4,895,000  
Deferred Financing Costs, Net 23,000 25,000  
Pru Loan F      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 4,840,000 4,895,000  
Deferred Financing Costs, Net $ 42,000 $ 42,000