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, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Divdends And Earnings Per Share Details Narrative
Dividends declared (amount)									$ 7,367	$ 8,330	$ 8,331
Dividends declared (per share)	$ 0.20	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 1.10	$ 1.20	$ 1.20