Note 12 - Income Taxes - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Allowance for loan losses	$ 1,351	$ 1,287
Funded status of pension plan	1,287	1,286
Net unrealized loss on securities	401	180
Deferred compensation	391	272
Accrued incentive compensation	148	136
Nonaccrual loan interest income	75	53
Securities impairment	70	199
Stock compensation	69	77
Business combination adjustments		38
Other	17	35
Gross deferred tax assets	3,809	3,563
Deferred tax liabilities:
Accrued pension liability	1,044	939
Depreciation	619	652
Deferred loan fees and costs	461	307
Intangible assets	215	204
Business combination adjustments	68
Other	53	52
Gross deferred tax liabilities	2,460	2,154
Net deferred tax asset	$ 1,349	$ 1,409