Note 10 - Fair Value Measurement - Details of Fair Value Adjustment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent
Total fair value adjustments, net	$ (4,723)	$ (35,792)	$ (11,806)
Fair Value, Inputs, Level 1 [Member]
Unrealized (loss) gain on investments in equity securities	(5,632)	(4,295)	10,268
Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Gain (loss) on derivative contracts	844	(32,655)	(22,074)
Gain on disposition or exchange of investments	$ 844	$ (32,655)	$ (22,074)
Securities Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Cost and Expense, Operating	Other Cost and Expense, Operating	Other Cost and Expense, Operating
Securities Investment [Member] | Fair Value, Inputs, Level 1 [Member]
Gain (loss) on derivative contracts	$ 65	$ 1,158	$ 0
Gain on disposition or exchange of investments	$ 65	$ 1,158	$ 0