Note 9 - Fair Value Measurements - Fair Value Valuation Method Significant Unobservable Inputs (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Non-marketable equity investment	$ 300
Fair Value, Inputs, Level 1 [Member]
Non-marketable equity investment	0
Fair Value, Inputs, Level 2 [Member]
Non-marketable equity investment	0
Fair Value, Inputs, Level 3 [Member]
Non-marketable equity investment	$ 300

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant