Note 13 - Income Taxes - Income Tax Expense (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current provision-
Federal	$ 15,236	$ 7,513	$ 21,826
State	2,300	2,592	3,531
Total current	17,536	10,105	25,357
Deferred provision-
Federal	8,260	29,561	23,243
State	71	2,084	1,986
Total deferred	8,331	31,645	25,229
Provision (benefit) for income taxes	$ 25,867	$ 41,750	$ 50,586