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Note 8 - Stock-based Compensation Expense - Stock Compensation Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement, Expense | $ 399,000 |
Awards issued and vested (in shares) | 135,000 |
Stock-based compensation expense | $ 399,000 |
Management Bonus Program [Member] |  |
Share-Based Payment Arrangement, Expense | $ 92,000 |
Awards issued and vested (in shares) | 11,000 |
Stock-based compensation expense | $ 92,000 |
Share-Based Payment Arrangement, Option [Member] |  |
Share-Based Payment Arrangement, Expense | $ 10,000 | $ 2,000
Awards issued and vested (in shares) | 3,000 |
Stock-based compensation expense | $ 10,000 | $ 2,000
Restricted Stock Units (RSUs) [Member] |  |
Awards issued and vested (in shares) | 132,000 | 168,000
Restricted Stock Units (RSUs) [Member] | Board Member [Member] |  |
Share-Based Payment Arrangement, Expense | $ 3,000 |
Stock-based compensation expense | 3,000 |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |
Share-Based Payment Arrangement, Expense | $ 288,000 |
Awards issued and vested (in shares) | 120,000 |
Stock-based compensation expense | $ 288,000 |
Restricted Stock Units (RSUs) [Member] | Non Employee Directors and Corporate Secretary [Member] |  |
Share-Based Payment Arrangement, Expense | $ 6,000 |
Awards issued and vested (in shares) | 1,000 |
Stock-based compensation expense | $ 6,000 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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