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Long-term debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Debt Disclosure [Abstract]    
Revolving credit agreements $ 1,044 $ 8,494
5.6% to 7.9% mortgage notes due in installments through 2027 38,135 40,191
Total debt 39,179 48,685
Less portion due within one year 4,315 4,180
Long-term debt $ 34,864 $ 44,505