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Note 5 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Equity securities at fair value (Note 2)	$ 2,667	$ 2,851
Securities available for sale (Note 2)	393,338	339,579
Loans to other financial institutions	55,064	51,048
Interest rate lock commitments	1,756	68
Deposits – noninterest-bearing	447,548	287,460
Deposits – interest-bearing	1,138,822	867,142
Fair Value, Inputs, Level 1 [Member]
Interest rate lock commitments	0	0
Fair Value, Inputs, Level 2 [Member]
Interest rate lock commitments	0	0
Fair Value, Inputs, Level 3 [Member]
Interest rate lock commitments	1,756	68
Reported Value Measurement [Member]
Cash and cash equivalents	117,883	59,558
Equity securities at fair value (Note 2)	2,667	2,851
Securities available for sale (Note 2)	393,338	339,579
Reserve Bank stock	6,771	6,458
Loans held for sale	35,826	3,095
Loans to other financial institutions	55,064	51,048
Loans, net	1,072,111	797,991
Accrued interest receivable	6,610	3,965
Interest rate lock commitments	1,756	68
Deposits – noninterest-bearing	447,548	287,460
Deposits – interest-bearing	1,138,822	867,142
Borrowings	13,234
Accrued interest payable	229	411
Federal Home Loan Bank advances		33,198
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	117,883	59,558
Equity securities at fair value (Note 2)	2,667	2,851
Securities available for sale (Note 2)	393,338	339,579
Reserve Bank stock	6,771	6,458
Loans held for sale	36,901	3,134
Loans to other financial institutions	55,064	51,048
Loans, net	1,069,641	793,270
Accrued interest receivable	6,610	3,965
Interest rate lock commitments	1,756	68
Deposits – noninterest-bearing	447,548	287,460
Deposits – interest-bearing	1,140,084	867,154
Borrowings	13,284
Accrued interest payable	229	411
Federal Home Loan Bank advances		33,243
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	117,883	59,558
Equity securities at fair value (Note 2)	1,187	1,379
Securities available for sale (Note 2)	0	0
Reserve Bank stock	0	0
Loans held for sale	0	0
Loans to other financial institutions	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Interest rate lock commitments	0	0
Deposits – noninterest-bearing	0	0
Deposits – interest-bearing	0	0
Borrowings	0
Accrued interest payable	0	0
Federal Home Loan Bank advances		0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Equity securities at fair value (Note 2)	0	0
Securities available for sale (Note 2)	382,025	327,212
Reserve Bank stock	6,771	6,458
Loans held for sale	36,901	3,134
Loans to other financial institutions	55,064	51,048
Loans, net	0	0
Accrued interest receivable	6,610	3,965
Interest rate lock commitments	1,756	68
Deposits – noninterest-bearing	447,548	287,460
Deposits – interest-bearing	1,140,084	867,154
Borrowings	13,284
Accrued interest payable	229	411
Federal Home Loan Bank advances		33,243
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Equity securities at fair value (Note 2)	1,480	1,472
Securities available for sale (Note 2)	11,313	12,367
Reserve Bank stock	0	0
Loans held for sale	0	0
Loans to other financial institutions	0	0
Loans, net	1,069,641	793,270
Accrued interest receivable	0	0
Interest rate lock commitments	0	0
Deposits – noninterest-bearing	0	0
Deposits – interest-bearing	0	0
Borrowings	0
Accrued interest payable	$ 0	0
Federal Home Loan Bank advances		$ 0

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- Definition

Fair value portion of accrued interest payable.

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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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- Definition

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