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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 05, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reverse stock split | 1-for-15 |  |
Reverse stock split fractional share settlement | 15 |  |
Restricted cash |  | $ 26,000 | $ 26,000
Deferred equity issuance costs |  | 75,000 | 112,000
Additional Paid-in Capital [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred equity issuance costs againist additional paid-in capital |  |  | $ 6,000
February 2024 Warrant Inducement [Member] | Additional Paid-in Capital [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred equity issuance costs againist additional paid-in capital |  | $ 37,000 |

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- Definition Sum of the carrying amounts as of the balance sheet date of deferred costs capitalized at the end of the reporting period that are expected to be charged against earnings within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 210 -Topic 954 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 + Details
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