Note 12 - Income Taxes - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 1,365	$ 1,351
Funded status of pension plan	1,389	1,287
Lease liability	358
Net unrealized loss on securities	26	401
Deferred compensation	417	391
Accrued incentive compensation	91	148
Nonaccrual loan interest income	40	75
Securities impairment	70	70
Stock compensation	91	69
Other	9	17
Gross deferred tax assets	3,856	3,809
Deferred tax liabilities:
Accrued pension liability	1,029	1,044
Depreciation	656	619
Deferred loan fees and costs	555	461
Lease right-of-use asset	317
Intangible assets	260	215
Business combination adjustments	137	68
Other	51	53
Gross deferred tax liabilities	3,005	2,460
Net deferred tax asset	$ 851	$ 1,349