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Long-term debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Sep. 30, 2014
Debt Disclosure [Abstract]    
Revolving credit $ 11,304 $ 10,363
5.6% to 7.9% mortgage notes due in installments through 2027 42,184 45,593
Total debt 53,488 55,956
Less portion due within one year 4,049 4,534
Long-term debt $ 49,439 $ 51,422