Note 8 - Income Taxes - Components of Income Tax (Benefit) Expense Recorded Directly to Stockholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrealized (losses) gains arising during period, tax	$ (1,171)	$ (839)	$ 2,383
Reclassification adjustment for securities losses reclassified out of other comprehensive income into loss on sale	0	0	3
Reclassification adjustment for impairment of equity security realized in income, tax	0	36	0
Unrealized gains arising during the period, tax	24	(41)	0
Minimum pension liability adjustment, tax	1	61	(69)
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	(1,705)	(673)	(378)
Total income tax (benefit) expense recorded directly to stockholders' equity	$ (2,851)	$ (1,456)	$ 1,939