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Note 15 - Share-based Compensation - Stock Options Outstanding (Details) | 12 Months Ended
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Sep. 30, 2023 $ / shares shares
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding | shares | 2,904,882
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term | 5 years 3 months
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 3.19
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | shares | 842,667
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 3.51
Range One [Member] |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit | 1.51
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit | $ 2.68
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding | shares | 217,517
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term | 3 years 2 months 19 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 2.12
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | shares | 129,157
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 1.74
Range Two [Member] |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit | 2.69
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit | $ 2.69
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding | shares | 1,100,000
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term | 6 years 7 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 2.69
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | shares | 0
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 0
Range Three [Member] |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit | 3.09
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit | $ 3.39
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding | shares | 759,138
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term | 5 years 6 months 21 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 3.29
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | shares | 191,825
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 3.39
Range Four [Member] |
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit | 3.4
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit | $ 8.03
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding | shares | 828,227
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term | 4 years 5 months 23 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price | $ 4.05
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | shares | 521,685
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ 4

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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