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Note 10 - Stock-based Compensation Plans - Stock Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lower Range of Exercise Price (in dollars per share) | $ 3.5 |  |
Upper Range of Exercise Price (in dollars per share) | $ 39.11 |  |
Number Outstanding (in shares) | 59,000 | 59,000 | 59,000
Outstanding Weighted Average Contractual Life Remaining (Year) | 4 years 7 months 6 days |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 17.35 |  |
Outstanding Aggregate Intrinsic Value | $ 179,290 |  |
Options Outstanding Exercise Price Range1 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 3.5 |  |
Upper Range of Exercise Price (in dollars per share) | $ 3.86 |  |
Number Outstanding (in shares) | 13,000 |  |
Outstanding Weighted Average Contractual Life Remaining (Year) | 3 years 2 months 12 days |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 3.75 |  |
Outstanding Aggregate Intrinsic Value | $ 131,050 |  |
Options Outstanding Exercise Price Range2 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 7.8 |  |
Number Outstanding (in shares) | 8,000 |  |
Outstanding Weighted Average Contractual Life Remaining (Year) | 4 years 4 months 24 days |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 7.8 |  |
Outstanding Aggregate Intrinsic Value | $ 48,240 |  |
Options Outstanding Exercise Price Range 3 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 19.99 |  |
Number Outstanding (in shares) | 30,000 |  |
Outstanding Weighted Average Contractual Life Remaining (Year) | 5 years 1 month 6 days |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 19.99 |  |
Options Outstanding Exercise Price Range 4 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 39.11 |  |
Number Outstanding (in shares) | 8,000 |  |
Outstanding Weighted Average Contractual Life Remaining (Year) | 5 years 4 months 24 days |  |
Outstanding Weighted Average Exercise Price (in dollars per share) | $ 39.11 |  |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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