Note 3 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Recurring [Member]
Liabilities, Fair Value Disclosure	$ 0	$ 0

Fair value of financial and nonfinancial obligations.

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