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Note 15 - Share-based Compensation - Stock Options Outstanding (Details) | 3 Months Ended
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Dec. 31, 2023 $ / shares shares
Lower Exercise Price (in dollars per share) | $ 1.51
Upper Exercise Price (in dollars per share) | $ 8.03
Number Outstanding (in shares) | shares | 3,766,772
Weighted Average Remaining Contractual Life (Year) | 5 years 5 months 26 days
Weighted average exercise price, outstanding balance (in dollars per share) | $ 2.85
Number Exercisable (in shares) | shares | 992,981
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.48
Range One [Member] |
Lower Exercise Price (in dollars per share) | 1.51
Upper Exercise Price (in dollars per share) | $ 1.76
Number Outstanding (in shares) | shares | 991,407
Weighted Average Remaining Contractual Life (Year) | 6 years 3 months 14 days
Weighted average exercise price, outstanding balance (in dollars per share) | $ 1.71
Number Exercisable (in shares) | shares | 104,157
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 1.75
Range Two [Member] |
Lower Exercise Price (in dollars per share) | 2.64
Upper Exercise Price (in dollars per share) | $ 2.68
Number Outstanding (in shares) | shares | 88,000
Weighted Average Remaining Contractual Life (Year) | 6 years 7 months 6 days
Weighted average exercise price, outstanding balance (in dollars per share) | $ 2.67
Number Exercisable (in shares) | shares | 0
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 0
Range Three [Member] |
Lower Exercise Price (in dollars per share) | 2.69
Upper Exercise Price (in dollars per share) | $ 2.69
Number Outstanding (in shares) | shares | 1,100,000
Weighted Average Remaining Contractual Life (Year) | 5 years 9 months 7 days
Weighted average exercise price, outstanding balance (in dollars per share) | $ 2.69
Number Exercisable (in shares) | shares | 125,000
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 2.69
Range Four [Member] |
Lower Exercise Price (in dollars per share) | 3.09
Upper Exercise Price (in dollars per share) | $ 8.03
Number Outstanding (in shares) | shares | 1,587,365
Weighted Average Remaining Contractual Life (Year) | 4 years 9 months
Weighted average exercise price, outstanding balance (in dollars per share) | $ 3.69
Number Exercisable (in shares) | shares | 763,824
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 3.84

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- 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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