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Note 8 - Stockholders' Equity - Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement, Expense | $ 93 | $ 63
Cost of Sales [Member] |  |
Share-Based Payment Arrangement, Expense | 5 | 8
Operating Expense [Member] |  |
Share-Based Payment Arrangement, Expense | $ 88 | $ 55

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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