Note 9 - Fair Values - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale	$ 579,664	$ 446,880
Reported Value Measurement [Member]
Cash and cash equivalents	177,118	106,986
Debt Securities, Available-for-sale	579,664	446,880
Net loans	1,074,102	1,123,051
FHLB stock	7,463	7,380
Deposits	1,697,338	1,542,779
Term debt	10,000	15,000
Junior subordinated debenture	10,310	10,310
FHLB stock	7,463	7,380
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	177,118	106,986
Debt Securities, Available-for-sale	0	0
Net loans	0	0
FHLB stock	7,463	7,380
Deposits	0	0
Term debt	0	0
Junior subordinated debenture	0	0
FHLB stock	7,463	7,380
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Debt Securities, Available-for-sale	579,664	446,880
Net loans	0	0
FHLB stock	0	0
Deposits	1,697,887	1,544,009
Term debt	10,043	15,536
Junior subordinated debenture	10,152	10,552
FHLB stock	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Debt Securities, Available-for-sale	0	0
Net loans	1,090,134	1,138,095
FHLB stock	0	0
Deposits	0	0
Term debt	0	0
Junior subordinated debenture	0	0
FHLB stock	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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 debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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

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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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