Note 5 - Investment in Equity-method Investee - Summary of Equity-method Investee (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net margin	$ 270,035	$ 182,105	$ 499,866	$ 326,840
Net (loss) income	$ 33,797	36,826	78,552	80,853
Net (loss) income attributable to our equity investment investee		(11)	$ (0)	8
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Net margin		6		61
Net (loss) income		$ (17)		$ 12