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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and Balance in the Loan Portfolio (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Beginning balance	$ 4,057	$ 4,673	$ 4,577
Charge-offs	(754)	(989)	(365)
Recoveries	290	373	426
Provision	4,000	0	35
Ending balance	7,593	4,057	4,673
Individually evaluated for impairment	431	355	297
Collectively evaluated for impairment	7,162	3,702	4,376
Individually evaluated for impairment	7,851	5,922	4,024
Collectively evaluated for impairment	1,039,745	788,397	405,049
Acquired with deteriorated credit quality	22,072	7,729
Loans	1,069,668	802,048	409,073
Agricultural [Member]
Beginning balance	471	481	506
Charge-offs	(15)	0	0
Recoveries	0	65	33
Provision	(199)	(75)	(58)
Ending balance	257	471	481
Individually evaluated for impairment	0	103	94
Collectively evaluated for impairment	257	368	387
Individually evaluated for impairment	348	924	578
Collectively evaluated for impairment	53,387	56,415	48,531
Acquired with deteriorated credit quality	0	0
Loans	53,735	57,339	49,109
Commercial and Industrial [Member]
Beginning balance	655	892	1,001
Charge-offs	(148)	(83)	(58)
Recoveries	57	22	107
Provision	763	(176)	(158)
Ending balance	1,327	655	892
Individually evaluated for impairment	19	0	3
Collectively evaluated for impairment	1,308	655	889
Individually evaluated for impairment	1,663	259	21
Collectively evaluated for impairment	295,154	141,583	91,385
Acquired with deteriorated credit quality	6,710	6,241
Loans	303,527	148,083	91,406
Consumer Portfolio Segment [Member]
Beginning balance	270	254	262
Charge-offs	(329)	(292)	(282)
Recoveries	204	136	112
Provision	172	172	162
Ending balance	317	270	254
Individually evaluated for impairment	1	4	13
Collectively evaluated for impairment	316	266	241
Individually evaluated for impairment	8	17	90
Collectively evaluated for impairment	33,982	38,524	24,292
Acquired with deteriorated credit quality	24	313
Loans	34,014	38,854	24,382
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	1,663	1,926	1,761
Charge-offs	(254)	(589)	0
Recoveries	10	26	61
Provision	2,759	300	104
Ending balance	4,178	1,663	1,926
Individually evaluated for impairment	157	13	20
Collectively evaluated for impairment	4,021	1,650	1,906
Individually evaluated for impairment	3,032	2,288	623
Collectively evaluated for impairment	453,681	323,358	138,830
Acquired with deteriorated credit quality	12,534	733
Loans	469,247	326,379	139,453
Construction Real Estate [Member]
Beginning balance	76	38	35
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	21	38	3
Ending balance	97	76	38
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	97	76	38
Individually evaluated for impairment	80	0	0
Collectively evaluated for impairment	16,559	13,411	8,843
Acquired with deteriorated credit quality	0	0
Loans	16,639	13,411	8,843
Residential Portfolio Segment [Member]
Beginning balance	640	537	726
Charge-offs	(8)	(25)	(25)
Recoveries	19	124	113
Provision	649	4	(277)
Ending balance	1,300	640	537
Individually evaluated for impairment	254	235	167
Collectively evaluated for impairment	1,046	405	370
Individually evaluated for impairment	2,720	2,434	2,712
Collectively evaluated for impairment	186,982	215,106	93,168
Acquired with deteriorated credit quality	2,804	442
Loans	192,506	217,982	95,880
Unallocated Financing Receivables [Member]
Beginning balance	282	545	286
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(165)	(263)	259
Ending balance	117	282	545
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 117	$ 282	$ 545

X

- Definition

The balance of financing receivables that were acquired with deteriorated credit quality.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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