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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 |

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