Note 9 - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal, current	$ 124	$ (94)	$ (816)
Federal, deferred	18,185	12,830	7,560
State, current	426	187	102
State, deferred	3,087	1,851	657
	$ 21,822	$ 14,774	$ 7,503