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Note 2 - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 363,916	$ 337,865
Gross Unrealized Gains	8,748	3,340
Gross Unrealized Losses	(139)	(1,626)
Fair Value	372,525	339,579
US Treasury and Government [Member]
Amortized Cost	2,009	17,231
Gross Unrealized Gains	56	23
Gross Unrealized Losses	0	(39)
Fair Value	2,065	17,215
US Treasury Securities [Member]
Amortized Cost	1,995	1,994
Gross Unrealized Gains	75	14
Gross Unrealized Losses	0	0
Fair Value	2,070	2,008
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	256,930	172,487
Gross Unrealized Gains	7,132	2,694
Gross Unrealized Losses	(132)	(1,257)
Fair Value	263,930	173,924
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	99,145	142,504
Gross Unrealized Gains	1,437	585
Gross Unrealized Losses	(7)	(329)
Fair Value	100,575	142,760
Corporate Debt Securities [Member]
Amortized Cost	2,837	2,649
Gross Unrealized Gains	48	24
Gross Unrealized Losses	0	(1)
Fair Value	2,885	2,672
Trust Preferred Securities [Member]
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 1,000	$ 1,000

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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