Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,853	9,749	9,828	9,730
Common shares issuable under share based payment plans which are potentially dilutive	40	69	45	83
Common shares used for diluted earnings per common share	9,893	9,818	9,873	9,813
Income from continuing operations	$ 1,820	$ 845	$ 9,293	$ 1,976
Discontinued operations	0	516	0	2,179
Net income	$ 1,820	$ 1,361	$ 9,293	$ 4,155
Basic earnings per common share
Income from continuing operations	$ 0.18	$ 0.09	$ 0.95	$ 0.20
Discontinued operations	0.00	0.05	0.00	0.23
Net income	0.18	0.14	0.95	0.43
Diluted earnings per common share
Income from continuing operations	0.18	0.09	0.94	0.20
Discontinued operations	0.00	0.05	0.00	0.22
Net income	$ 0.18	$ 0.14	$ 0.94	$ 0.42