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Note 9 - Shareholders' Equity - Schedule of Stock Option by Exercise Price (Details) | 9 Months Ended
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Sep. 30, 2023 $ / shares shares
Options outstanding, number of shares (in shares) | shares | 23,176
Options outstanding, lower exercise price range (in dollars per share) | $ 7.2
Options outstanding, upper exercise price range (in dollars per share) | 226.2
Options outstanding, weighted average exercise price (in dollars per share) | $ 38.92
Options outstanding, remaining contractual term (Year) | 3 years 2 months 12 days
Options exercisable, number of shares (in shares) | shares | 23,176
Options exercisable, weighted average exercise price (in dollars per share) | $ 38.92
Exercise Price Between 7.20 and 11.60 [Member] |
Options outstanding, number of shares (in shares) | shares | 16,500
Options outstanding, lower exercise price range (in dollars per share) | $ 7.2
Options outstanding, upper exercise price range (in dollars per share) | 11.6
Options outstanding, weighted average exercise price (in dollars per share) | $ 10
Options outstanding, remaining contractual term (Year) | 4 years
Options exercisable, number of shares (in shares) | shares | 16,500
Options exercisable, weighted average exercise price (in dollars per share) | $ 10
Exercise Price Between 90.00 and 90.00 [Member] |
Options outstanding, number of shares (in shares) | shares | 5,676
Options outstanding, lower exercise price range (in dollars per share) | $ 90
Options outstanding, upper exercise price range (in dollars per share) | 90
Options outstanding, weighted average exercise price (in dollars per share) | $ 90
Options outstanding, remaining contractual term (Year) | 1 year 3 months 18 days
Options exercisable, number of shares (in shares) | shares | 5,676
Options exercisable, weighted average exercise price (in dollars per share) | $ 90
Exercise Price Between 226.20 and 226.20 [Member] |
Options outstanding, number of shares (in shares) | shares | 1,000
Options outstanding, lower exercise price range (in dollars per share) | $ 226.2
Options outstanding, upper exercise price range (in dollars per share) | 226.2
Options outstanding, weighted average exercise price (in dollars per share) | $ 226.2
Options outstanding, remaining contractual term (Year) | 1 year
Options exercisable, number of shares (in shares) | shares | 1,000
Options exercisable, weighted average exercise price (in dollars per share) | $ 226.2

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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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