Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,749	9,619	9,730	9,593
Common shares issuable under share based payment plans which are potentially dilutive	69	88	83	97
Common shares used for diluted earnings per common share	9,818	9,707	9,813	9,690
Income from continuing operations	$ 845	$ 917	$ 1,976	$ 2,083
Discontinued operations	516	787	2,179	1,961
Net income	$ 1,361	$ 1,704	$ 4,155	$ 4,044
Basic earnings per common share
Income from continuing operations	$ 0.09	$ 0.10	$ 0.20	$ 0.22
Discontinued operations	0.05	0.08	0.23	0.20
Net income	0.14	0.18	0.43	0.42
Diluted earnings per common share
Income from continuing operations	0.09	0.10	0.20	0.22
Discontinued operations	0.05	0.08	0.22	0.20
Net income	$ 0.14	$ 0.18	$ 0.42	$ 0.42