Note 8 - Income Taxes - Components of Income Tax (Benefit) Expense Recorded Directly to Stockholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrealized (losses) gains on securities available-for-sale, tax	$ (531)	$ (1,171)	$ (839)
Reclassification adjustment for securities losses reclassified out of other comprehensive income into loss on sale	81	0	0
Reclassification adjustment for impairment of equity security realized in income, tax	0	0	36
Unrealized (losses) gains on hedging instruments, tax	112	24	(41)
Minimum pension liability adjustment, tax	(9)	1	61
Compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes		(1,705)	(673)
Total income tax (benefit) expense recorded directly to stockholders’ equity	$ (347)	$ (2,851)	$ (1,456)