Note 10 - Income Taxes - Allocation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current	$ 3,934	$ 4,730	$ 5,105
Deferred income tax expense	18	10	73
Total income tax expense	$ 3,952	$ 4,740	$ 5,178