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Note 7 - Share-based Compensation (Details Textual) - USD ($) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Inducement Plan [Member] |  |
Share-Based Payment Arrangement, Expense | $ 47,000 | $ 110,000
Share-Based Payment Arrangement, Expense, Tax Benefit | 5,100 | 27,000
The 2018 Plan [Member] | Restricted Stock [Member] |  |
Share-Based Payment Arrangement, Expense | 126,000 | 40,000
Share-Based Payment Arrangement, Expense, Tax Benefit | $ 7,700 | $ 10,000

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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 Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: 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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