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Note 13 - Income Taxes - Income Tax Expense (Benefits) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Domestic                 $ 146,055 $ 188,174 $ 183,169
Foreign                 5,668 1,349 0
Income before taxes $ 53,614 $ 43,928 $ 22,512 $ 31,669 $ 33,345 $ 52,210 $ 54,410 $ 49,558 151,723 189,523 183,169
Current provision                      
Federal, Current                 67,988 20,303 31,819
State, Current                 6,706 4,648 6,291
Total Current                 74,694 24,951 38,110
Deferred provision                      
Federal, Deferred                 (37,683) 20,925 6,082
State, Deferred                 (1,254) 2,064 (85)
Foreign, Deferred                 1,079 0 0
(Benefit) provision for deferred income tax expense                 (37,858) 22,989 5,997
Provision (benefit) for income taxes                 $ 36,836 $ 47,940 $ 44,107