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Note 8 - Stock-based Compensation Expense - Stock Compensation Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Share-Based Payment Arrangement, Expense | $ 373,000 |
Awards issued and vested (in shares) | 120,000 |
Stock-based compensation expense | $ 373,000 |
Management Bonus Program [Member] |  |
Awards issued and vested (in shares) | 0 |
Share-Based Payment Arrangement, Option [Member] |  |
Share-Based Payment Arrangement, Expense | $ 17,000 | $ 34,000
Stock-based compensation expense | $ 17,000 | $ 34,000
Restricted Stock Units (RSUs) [Member] |  |
Awards issued and vested (in shares) | 120,000 | 116,000
Restricted Stock Units (RSUs) [Member] | Board Member [Member] |  |
Share-Based Payment Arrangement, Expense | $ 4,000 |
Stock-based compensation expense | 4,000 |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |
Share-Based Payment Arrangement, Expense | $ 352,000 |
Awards issued and vested (in shares) | 120,000 |
Stock-based compensation expense | $ 352,000 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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