Note 13 - Income Taxes - Income Tax Expense (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current provision -
Federal	$ 20,303	$ 31,819	$ 22,443
State	4,648	6,291	4,030
Total current	24,951	38,110	26,473
Deferred provision -
Federal	20,925	6,082	(64,821)
State	2,064	(85)	2,618
Total deferred	22,989	5,997	(62,203)
Provision (benefit) for income taxes	$ 47,940	$ 44,107	$ (35,730)