Note 17 - Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Recognized Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage servicing rights	$ 1,868	$ 1,132	$ 1,061	$ 1,313
Total financial assets	1,000,421	905,644
Total financial liabilities	948,139	858,050
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	75,202	57,034
Fair Value, Inputs, Level 1 [Member] \| Non-Maturity Deposits [Member]
Deposits	800,966	686,047
Fair Value, Inputs, Level 3 [Member]
Loans held for sale	9,146	18,427
Net loans	600,512	625,628
Mortgage servicing rights	1,868	1,132	$ 1,061	$ 1,313
Hedging assets	922	3,245
Other borrowings	7,012	7,750
Junior subordinated deferrable interest debentures	10,931	10,300
Hedging liabilities	46	616
Fair Value, Inputs, Level 3 [Member] \| Maturity Deposits [Member]
Deposits	129,196	153,337
Fair Value, Inputs Level 2 and Level 3 [Member]
Securities, including FHLB stock	312,771	200,178
Reported Value Measurement [Member]
Total financial assets	999,113	904,125
Total financial liabilities	950,435	859,686
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	75,202	57,034
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Non-Maturity Deposits [Member]
Deposits	800,966	686,047
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Loans held for sale	9,146	18,427
Net loans	599,204	624,109
Mortgage servicing rights	1,868	1,132
Hedging assets	922	3,245
Other borrowings	7,012	7,750
Junior subordinated deferrable interest debentures	12,976	12,942
Hedging liabilities	46	616
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Maturity Deposits [Member]
Deposits	129,447	152,331
Reported Value Measurement [Member] \| Fair Value, Inputs Level 2 and Level 3 [Member]
Securities, including FHLB stock	$ 312,771	$ 200,178

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value of all derivative assets designated as fair value hedging instruments.

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Fair value of all derivative liabilities designated as fair value hedging instruments.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of other liabilities.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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