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Note 10 - Stockholders' Equity - Roll Forward of Outstanding Shares (Details) - shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Shares, balance (in shares) | 5,454,639 | 5,434,521
Held in treasury, balance (in shares) | (81,584) | (81,584)
Shares outstanding, balance (in shares) | 5,373,055 | 5,352,937
Stock-based compensation (in shares) | 0 | 20,118
Shares, balance (in shares) | 5,454,639 | 5,454,639
Held in treasury, balance (in shares) | (81,584) | (81,584)
Shares outstanding, balance (in shares) | 5,373,055 | 5,373,055

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
Name: | us-gaap_SharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
Name: | us-gaap_TreasuryStockCommonShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant