Operations and summary of significant accounting policies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			24 Months Ended	36 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2014
Basis of Presentation
Selling, general, and administrative expenses include net foreign currency transaction gains (losses)		$ (1,089,000)	$ (2,738,000)	$ (480,000)
Customer deposits recorded against inventory when right of offset exists	0	0				0
Goodwill, Impairment Loss	0					0
Asset Impairment Charges		$ 3,138,000			$ 0