Note 1 - Business and Summary of Significant Accounting Policies (Details Textual)	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		3 years
Domestic Tax Jurisdiction [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Year	2022 2023 2024
State and Local Jurisdiction [Member] \| California Franchise Tax Board [Member]
Open Tax Year	2021 2022 2023 2024

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration