Note 5 - Investments - Fair Value Measurement on Recurring Basis (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($)
Purchases	$ 1,250
Total investments	1,250
Common Stock [Member]
Purchases	250
Total investments	250
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Purchases	1,000
Total investments	$ 1,000

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration