Divdends and earnings per share (Details Narrative) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Divdends And Earnings Per Share Details Narrative
Dividends declared (amount)									$ 10,830	$ 7,367	$ 8,330
Dividends declared (per share)	$ 0.66	$ 0.30	$ 0.30	$ 0.30	$ 0.20	$ 0.30	$ 0.30	$ 0.30	$ 1.56	$ 1.10	$ 1.20