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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized cost, available for sale securities	$ 220,090	$ 136,355
Gross unrealized gains, available for sale securities	3,150	3,952
Gross unrealized losses, available for sale securities	(1,004)	(82)
Fair value, available for sale securities	222,236	140,225	[1]
Amortized cost, held to maturity securities	10,898	14,234	[1]
Gross unrealized gains, held to maturity securities	265	509
Gross unrealized losses, held to maturity securities	0	0
Fair value, held to maturity securities	11,163	14,743	[1]
Amortized cost, total securities	230,988	150,589
Gross unrealized gains, total securities	3,415	4,461
Gross unrealized losses, total securities	(1,004)	(82)
Total securities	233,399	154,968
US Treasury Securities [Member]
Amortized cost, available for sale securities	19,949
Gross unrealized gains, available for sale securities	29
Gross unrealized losses, available for sale securities	(32)
Fair value, available for sale securities	19,946
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	141,497	98,848
Gross unrealized gains, available for sale securities	2,070	2,830
Gross unrealized losses, available for sale securities	(739)	(80)
Fair value, available for sale securities	142,828	101,598
Amortized cost, held to maturity securities	7,950	9,588
Gross unrealized gains, held to maturity securities	157	264
Gross unrealized losses, held to maturity securities	0	0
Fair value, held to maturity securities	8,107	9,852
Municipal Bonds [Member]
Amortized cost, available for sale securities	58,644	37,507
Gross unrealized gains, available for sale securities	1,051	1,122
Gross unrealized losses, available for sale securities	(233)	(2)
Fair value, available for sale securities	59,462	38,627
Amortized cost, held to maturity securities	2,948	3,146
Gross unrealized gains, held to maturity securities	108	140
Gross unrealized losses, held to maturity securities	0	0
Fair value, held to maturity securities	$ 3,056	3,286
Corporate Debt Securities [Member]
Amortized cost, held to maturity securities		1,500
Gross unrealized gains, held to maturity securities		105
Gross unrealized losses, held to maturity securities		0
Fair value, held to maturity securities		$ 1,605
[1] Derived from audited consolidated financial statements.

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