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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of Loans by Loan Category (Details) - USD ($) $ in Thousands		Mar. 31, 2022		Dec. 31, 2021	Mar. 31, 2021
Loans		$ 1,027,406		$ 1,016,848	$ 1,035,083
Loan 90 days and accruing		0		0
Agricultural [Member]
Loans		61,618		64,819	46,686
Loan 90 days and accruing		0		0
Commercial and Industrial [Member]
Loans		198,914		203,024	298,050
Loan 90 days and accruing		0		0
Consumer Portfolio Segment [Member]
Loans		36,151		35,174	32,330
Loan 90 days and accruing		0		0
Commercial Real Estate Portfolio Segment [Member]
Loans		537,252		525,884	462,421
Loan 90 days and accruing		0		0
Construction Real Estate [Member]
Loans		15,669		19,066	15,670
Loan 90 days and accruing		0		0
Residential Portfolio Segment [Member]
Loans		177,802		168,881	$ 179,926
Loan 90 days and accruing		0		0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans		2,098	[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]	0		21
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	66		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]	2,032		1,489
Financial Asset, 60 to 89 Days Past Due [Member]
Loans		121	[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]	93		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]	28		306
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans		117	[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]	85		88
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	32		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]	0		454
Financial Asset, Past Due [Member]
Loans		2,336	[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]	178		109
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans	[1]	98		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]	2,060		2,249
Financial Asset, Not Past Due [Member]
Loans		1,025,070		1,011,307
Financial Asset, Not Past Due [Member] | Agricultural [Member]
Loans		61,618		64,819
Financial Asset, Not Past Due [Member] | Commercial and Industrial [Member]
Loans		198,736		202,915
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans		36,053		35,089
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans		537,252		525,170
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans		15,669		16,682
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans		$ 175,742		$ 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.

+ References

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- Definition

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