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Note 1 - Organization and Description of Business and Significant Accounting Policies - Additional Information Related to RSUs (Details) - Restricted Stock Units (RSUs) [Member] $ in Thousands | 12 Months Ended
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Sep. 30, 2023 USD ($)
Unrecognized compensation expense related to RSUs | $ 2,386
Weighted average remaining period to expense for RSUs (in years) (Year) | 3 years 1 month 6 days

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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