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Note 6 - Investment in Equity-method Investee - Summary of Equity-method Investee (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net margin $ 277,954 $ 203,949 $ 777,820 $ 530,789
Net income $ 32,370 47,097 110,922 127,950
Net income attributable to our equity investment investee   8 $ (0) 16
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]        
Net margin   33   94
Net income   $ 11   $ 23