Note 8 - Fair Value Measurements - Level 1 Assets (Details) $ in Thousands	6 Months Ended
Jun. 30, 2023 USD ($)
Balance	$ 17,500
Fair Value, Inputs, Level 1 [Member]
Balance	0
Balance	17,500
Fair Value, Inputs, Level 1 [Member] \| Certificates of Deposit [Member]
Investments in Certificates of Deposit	$ 17,500

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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