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Note 5 - Financial Instruments - Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Equity securities at fair value (Note 2)	$ 8,405		$ 2,896
Securities available for sale (Note 2)	855,555		574,787
Deposits – noninterest-bearing	527,964		477,654
Deposits – interest-bearing	1,352,771		1,196,924
Loans to other financial institutions	0		35,209
Fair Value, Inputs, Level 1 [Member]
Securities available for sale (Note 2)	0
Fair Value, Inputs, Level 2 [Member]
Securities available for sale (Note 2)	842,430
Fair Value, Inputs, Level 3 [Member]
Securities available for sale (Note 2)	13,125
Reported Value Measurement [Member]
Cash and cash equivalents	95,318		79,519
Equity securities at fair value (Note 2)	8,405		2,896
Securities available for sale (Note 2)	855,555		574,787
Federal Home Loan Bank and Federal Reserve Bank stock	8,004		8,004
Loans held for sale	12,884		12,921
Loans, net	996,637		1,062,075
Accrued interest receivable	7,544		6,521
Interest rate lock commitments	407		842
Deposits – noninterest-bearing	527,964		477,654
Deposits – interest-bearing	1,352,771		1,196,924
Borrowings	2,642
Subordinated debentures	3,140		3,089
Accrued interest payable	96		183
Loans to other financial institutions		$ 35,209
Borrowings			9,327
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	95,318		79,519
Equity securities at fair value (Note 2)	8,405		2,896
Securities available for sale (Note 2)	855,555		574,787
Federal Home Loan Bank and Federal Reserve Bank stock	8,004		8,004
Loans held for sale	13,270		13,350
Loans, net	990,778		1,057,786
Accrued interest receivable	7,544		6,521
Interest rate lock commitments	407		842
Deposits – noninterest-bearing	527,964		477,654
Deposits – interest-bearing	1,353,345		1,197,964
Borrowings	2,504
Subordinated debentures	2,977		3,089
Accrued interest payable	96		183
Loans to other financial institutions		35,209
Borrowings			9,143
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	95,318		79,519
Equity securities at fair value (Note 2)	6,739		1,411
Securities available for sale (Note 2)	0		0
Federal Home Loan Bank and Federal Reserve Bank stock	0		0
Loans held for sale	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
Subordinated debentures	0		0
Accrued interest payable	0		0
Loans to other financial institutions		0
Borrowings			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)	842,430		563,364
Federal Home Loan Bank and Federal Reserve Bank stock	8,004		8,004
Loans held for sale	13,270		13,350
Loans, net	0		0
Accrued interest receivable	7,544		6,521
Interest rate lock commitments	407		842
Deposits – noninterest-bearing	527,964		477,654
Deposits – interest-bearing	1,353,345		1,197,964
Borrowings	2,504
Subordinated debentures	2,977		3,089
Accrued interest payable	96		183
Loans to other financial institutions		35,209
Borrowings			9,143
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)	1,666		1,485
Securities available for sale (Note 2)	13,125		11,423
Federal Home Loan Bank and Federal Reserve Bank stock	0		0
Loans held for sale	0		0
Loans, net	990,778		1,057,786
Accrued interest receivable	0		0
Interest rate lock commitments	0		0
Deposits – noninterest-bearing	0		0
Deposits – interest-bearing	0		0
Borrowings	0
Subordinated debentures	0		0
Accrued interest payable	$ 0		0
Loans to other financial institutions		$ 0
Borrowings			$ 0

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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