Note 19 - Fair Value of Financial Instruments - Fair Value, Investments, Entities that Calculate Net Asset Value Per Share (Details) - Limited Liability Investments [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Equity Method Investments, Fair Value Disclosure	$ 20,362	$ 32,811
Fair Value Measured at Net Asset Value Per Share [Member]
Equity Method Investments, Fair Value Disclosure	$ 17,060	$ 29,548

Fair value portion of investments accounted under the equity method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=125513658&loc=d3e32014-111567

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