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Long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Debt Disclosure [Abstract]    
Revolving credit agreements $ 6,665 $ 6,807
5.6% to 7.9% mortgage notes due in installments through 2027 34,080 35,125
Total debt 40,745 41,932
Less portion due within one year 4,526 4,455
Long-term debt $ 36,219 $ 37,477