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Note 5 - Stock-Based Compensation - Unrecognized Compensation Cost Related to Non-Vested Stock-Based Awards Granted (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Total unrecognized compensation costs | $ 21,772 | $ 15,370

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- Definition Amount of cost not yet recognized for nonvested 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 (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant