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Note 3 - Loans and Allowance for Loan Losses - Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans (Note 3)	$ 1,069,668	$ 802,048
Allowance for loan losses (Note 3)	(7,593)	(4,057)	$ (4,673)	$ (4,577)
Loans, net	1,062,075	797,991
Agricultural [Member]
Loans (Note 3)	53,735	57,339
Allowance for loan losses (Note 3)	(257)	(471)	(481)	(506)
Commercial and Industrial [Member]
Loans (Note 3)	303,527	148,083
Allowance for loan losses (Note 3)	(1,327)	(655)	(892)	(1,001)
Consumer Portfolio Segment [Member]
Loans (Note 3)	34,014	38,854
Allowance for loan losses (Note 3)	(317)	(270)	(254)	(262)
Commercial Real Estate Portfolio Segment [Member]
Loans (Note 3)	469,247	326,379
Allowance for loan losses (Note 3)	(4,178)	(1,663)	(1,926)	(1,761)
Construction Real Estate [Member]
Loans (Note 3)	16,639	13,411
Allowance for loan losses (Note 3)	(97)	(76)	(38)	(35)
Residential Portfolio Segment [Member]
Loans (Note 3)	192,506	217,982
Allowance for loan losses (Note 3)	$ (1,300)	$ (640)	$ (537)	$ (726)

X

- Definition

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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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