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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Sep. 30, 2022		Dec. 31, 2021	Sep. 30, 2021
Loans		$ 1,132,401		$ 1,016,848	$ 988,357
Loan 90 days and accruing		0		0
Agricultural [Member]
Loans		63,347		64,819	63,445
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Loans		208,590		203,024	217,242
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Loans		38,356		35,174	33,806
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Loans		593,195		525,884	485,332
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Loans		14,299		19,066	18,238
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Loans		214,614		168,881	$ 170,294
Loan 90 days and accruing				0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans		1,130	[1]	3,151
Financial Asset, 30 to 59 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	1,065		21
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	17		70
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	0		422
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		1,149
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	48		1,489
Financial Asset, 60 to 89 Days Past Due [Member]
Loans		615	[1]	1,569
Financial Asset, 60 to 89 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	0		0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	0		15
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	0		13
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		1,235
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	615		306
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans		77	[1]	821
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	46		88
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	0		279
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	31		454
Financial Asset, Past Due [Member]
Loans		1,822	[1]	5,541
Financial Asset, Past Due [Member] | Agricultural [Member]
Loans	[1]	0		0
Financial Asset, Past Due [Member] | Commercial and Industrial [Member]
Loans	[1]	1,111		109
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	17		85
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	[1]	0		714
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans	[1]	0		2,384
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member]
Loans	[1]	694		2,249
Financial Asset, Not Past Due [Member]
Loans		1,130,579		1,011,307
Financial Asset, Not Past Due [Member] | Agricultural [Member]
Loans		63,347		64,819
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member]
Loans		207,479		202,915
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans		38,339		35,089
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans		593,195		525,170
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans		14,299		16,682
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans		$ 213,920		$ 166,632
[1] Includes nonaccrual loans.

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- Definition

Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

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- Definition

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