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Note 10 - Stockholders' Equity - Rollforward of Outstanding Shares (Details) - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Shares, beginning of year (in shares) | 5,454,639 | 5,454,639
Held in treasury, balance (in shares) | (81,584) | (81,584)
Shares, beginning of year (in shares) | (5,373,055) | (5,373,055)
Shares, beginning of year (in shares) | 5,373,055 | 5,373,055
Stock-based compensation (in shares) |  | 0
Shares, end of period (in shares) |  | 5,454,639
Held in treasury, balance (in shares) | (81,584) | (81,584)
Shares, end of period (in shares) |  | (5,373,055)
Shares, end of period (in shares) |  | 5,373,055
Common Stock [Member] |  |
Shares, beginning of year (in shares) | 5,454,639 |
Stock-based compensation (in shares) | 16,156 |
Shares, end of period (in shares) | 5,470,795 | 5,454,639
Treasury Stock, Common [Member] |  |
Held in treasury, balance (in shares) | (81,584) |
Held in treasury, balance (in shares) | (81,584) | (81,584)
Common Stock Outstanding [Member] |  |
Shares, beginning of year (in shares) | 5,373,055 |
Shares, beginning of year (in shares) | (5,373,055) |
Stock-based compensation (in shares) | 16,156 |
Shares, end of period (in shares) | 5,389,211 | 5,373,055
Shares, end of period (in shares) | (5,389,211) | (5,373,055)

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- 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
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- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
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- Definition Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 + Details
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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
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