Note 17 - Income Taxes - Significant Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses	$ 838	$ 603
Acquired loan credit mark	684	1,061
Deferred compensation	315	322
Investment impairment charge recorded directly to stockholders’ equity as a component of other comprehensive income	47	57
Minimum pension liability	259	276
Net operating loss carryforward	1,666	1,738
Alternative minimum tax credit carryforward		294
Net unrealized losses on securities available for sale		247
Nonaccrual interest income	445	206
Purchase accounting adjustments	1	144
Other	103	216
	4,358	5,164
Deferred loan origination costs	365	635
Core deposit intangible	661	831
Accrued pension costs	1,113	1,049
Depreciation	1,059	795
Merger expenses	161
Net unrealized losses on securities available for sale	14
Accretion of discount on investment securities, net		1
	3,373	3,311
Net deferred tax asset	$ 985	$ 1,853