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Note 5 - Fair Value Measurements (Details Textual) $ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 01, 2020 USD ($) | Oct. 01, 2020 CAD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Aug. 31, 2020 CAD ($)
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ (76) |  |
Foreign Exchange Forward [Member] |  |  |  |  |
Derivative, Notional Amount |  |  |  | 0 | $ 6,955
Foreign Exchange Forward [Member] | Subsequent Event [Member] |  |  |  |  |
Payments for Derivative Instrument, Financing Activities | $ 5,281 | $ 6,955 |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ (48) |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Marketable Securities, Total |  |  | $ 0 | $ 0 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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