Segment and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Details of sales
Sales	$ 36,949	$ 55,201	$ 56,233	$ 43,281	$ 32,805	$ 46,368	$ 50,696	$ 43,101	$ 191,664	$ 172,970	$ 128,533
United States [Member]
Details of sales
Sales									216,741	155,781	127,972
Canada [Member]
Details of sales
Sales									23,741	8,966	3,706
Russian Federation [Member]
Details of sales
Sales									9,837	10,144	7,973
United Kingdom [Member]
Details of sales
Sales									4,064	4,883	3,432
Eliminations [Member]
Details of sales
Sales									$ (62,719)	$ (6,804)	$ (14,550)