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Note 6 - Stock Based Compensation - Summary of Stock Based Compensation Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Options outstanding, number of options (in shares) | 10,000 | 16,668
Options outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.75 | $ 143.62
Options exercisable, number of options (in shares) | 6,668 | 10,000
Options exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.75 | $ 239.38
Vested, outstanding, number of options (in shares) | 0 | 0
Vested, outstanding, , Weighted Average Exercise Price (in dollars per share) |  | $ 0
Vested exercisable, number of options (in shares) | 3,332 | 3,336
Vested exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.75 | $ 48.75
Expired, outstanding, number of options (in shares) |  | (6,668)
Expired, outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 285.89
Expired exercisable, number of options (in shares) |  | (6,668)
Expired exercisable, Weighted Average Exercise Price (in dollars per share) |  | $ 285.89
Options outstanding, number of options (in shares) | 10,000 | 10,000
Options outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.75 | $ 48.75
Options exercisable, number of options (in shares) | 10,000 | 6,668
Options exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.75 | $ 48.75

X
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- Definition Number of options exercisable vested. + References No definition available. + Details
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- Definition Weighted average price of options exercisable exercised in period. + References No definition available. + Details
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- Definition Weighted average price of options exercisable vested in period. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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