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Operations and summary of significant accounting policies (Narrative) (Details) - USD ($) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2017
Basis of Presentation |  |  |  |
Selling, general, and administrative expenses include net foreign currency transaction gains (losses) | $ (651,000) | $ 701,000 | $ (1,721,000) |
Goodwill, Impairment Loss | $ 0 |  |  |
Asset Impairment Charges |  |  |  | $ 0

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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