Cash dividends (Details) (USD $)			0 Months Ended
	Jun. 28, 2014	Sep. 30, 2013	Aug. 01, 2014 Series A Convertible Preferred Stock [Member] Subsequent Event [Member]	Aug. 01, 2014 Series A Convertible Preferred Stock [Member] Subsequent Event [Member]
Preference share dividends [Abstract]
Series A Convertible Preferred Stock offering rights				$ 10,000,000
Series A Convertible Preferred Stock, stated value (in dollars per share)	$ 0.10	$ 0.10		$ 24
Percentage of cumulative annual dividend, Series A Convertible Preferred Stock (in hundredths)			4.00%
Maximum shares to be issued (in shares)				465,500
Maximum annual dividend				$ 446,880
Dividend payable			Oct. 15, 2014