Note 10 - Income Taxes (Details) - Allocation of Income Tax Expense - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allocation of Income Tax Expense [Abstract]
Current	$ 4,730	$ 5,105	$ 5,253
Deferred expense	10	73	64
Total income tax expense	$ 4,740	$ 5,178	$ 5,317