Note 7 - Investments and Fair Value Measurements (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Mar. 23, 2022	Dec. 31, 2022	Dec. 31, 2021
Equity Securities without Readily Determinable Fair Value, Amount		$ 201,500	$ 161,600
Equity Method Investments		28,300	54,600
Provision for Credit Loss on Investments		0	0
Vexcel Group, Inc. [Member]
Payments to Acquire Equity Securities, FV-NI	$ 37,000
Ownership Percentage, Acquired	4.60%
Equity Securities Without Readily Determinable Market Values, Ownership Percentage	43.30%
Equity Securities without Readily Determinable Fair Value, Amount		181,100	144,100
Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Investments, Fair Value Disclosure, Total		$ 4,000	$ 5,000