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Note 13 - Share-based Compensation - Summary of Significant Assumptions for Share-based Compensation Awards (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Share-Based Payment Arrangement, Option [Member] |  |
Weighted average fair value per share at grant date (in dollars per share) | $ 4.14 | $ 5.39
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |
Risk free interest rate | 3.50% | 1.60%
Expected award life (years) (Year) | 3 years | 3 years
Expected volatility | 46.90% | 46.80%
Expected dividend yield | 4.70% | 2.40%
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |
Risk free interest rate | 4.90% | 3.80%
Expected award life (years) (Year) | 10 years | 10 years
Expected volatility | 67.80% | 65.00%
Expected dividend yield | 7.10% | 5.60%
Stock Appreciation Rights (SARs) [Member] |  |
Risk free interest rate | 4.00% |
Expected award life (years) (Year) | 3 years |
Expected volatility | 67.80% |
Expected dividend yield | 4.70% |
Weighted average fair value per share at grant date (in dollars per share) | $ 4.58 | $ 6.34
Stock Appreciation Rights (SARs) [Member] | Minimum [Member] |  |
Risk free interest rate |  | 1.60%
Expected award life (years) (Year) |  | 3 years
Expected volatility |  | 61.60%
Expected dividend yield |  | 2.40%
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |
Risk free interest rate |  | 3.80%
Expected award life (years) (Year) |  | 4 years
Expected volatility |  | 64.80%
Expected dividend yield |  | 5.60%

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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