Note 10 - Income Taxes - The Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Computed “expected” income tax expense	$ 6,613	$ 7,201	$ 7,732
Tax-exempt interest income	(2,234)	(2,381)	(2,422)
Nondeductible interest expense	92	101	102
Other, net	(519)	(181)	(234)
Total income tax expense	$ 3,952	$ 4,740	$ 5,178