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Note 5 - Transactions With Affiliated Companies (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investment, Affiliated Issuer, Noncontrolled [Member]
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)		$ 0
Investment, Affiliated Issuer, Controlled [Member]
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease)	$ 0

X

- Definition

Amount of increase (decrease) in the investments in and advances to affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 1)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentIssuerAffiliationAxis=us-gaap_InvestmentAffiliatedIssuerControlledMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: