Note 12 - Income Taxes - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for loan losses	$ 2,005	$ 1,365
Funded status of pension plan	1,516	1,389
Lease liability	326	358
Net unrealized loss on securities		26
Deferred compensation	444	417
Accrued incentive compensation	60	91
Nonaccrual loan interest income	48	40
Securities impairment	70	70
Stock compensation	105	91
Other	15	9
Gross deferred tax assets	4,589	3,856
Deferred tax liabilities:
Accrued pension liability	1,036	1,029
Depreciation	772	656
Deferred loan fees and costs	519	555
Lease right-of-use asset	289	317
Intangible assets	305	260
Net unrealized gains on securities	593
Business combination adjustments	188	137
Other	47	51
Gross deferred tax liabilities	3,749	3,005
Net deferred tax asset	$ 840	$ 851