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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 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
Equity Securities [Member]
Equity securities at fair value (Note 2)		2,896
US Treasury and Government [Member]
Securities available for sale (Note 2)	2,030	2,051
US Treasury Securities [Member]
Securities available for sale (Note 2)	37,361	2,056
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale (Note 2)	487,441	320,368
Collateralized Mortgage Backed Securities [Member]
Equity securities at fair value (Note 2)	8,405
Securities available for sale (Note 2)	318,313	246,723
Corporate Debt Securities [Member]
Securities available for sale (Note 2)	8,342	3,589
Asset-backed Securities [Member]
Securities available for sale (Note 2)	2,068	0
Fair Value, Recurring [Member]
Securities available for sale (Note 2)		574,787
Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities at fair value (Note 2)	8,405	2,896
Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale (Note 2)	2,030	2,051
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale (Note 2)	37,361	2,056
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale (Note 2)	487,441	320,368
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Securities available for sale (Note 2)	318,313	246,723
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale (Note 2)	8,342	3,589
Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Securities available for sale (Note 2)	2,068
Fair Value, Inputs, Level 1 [Member]
Securities available for sale (Note 2)	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Securities available for sale (Note 2)		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities at fair value (Note 2)	6,739	1,411
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [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 2 [Member] | Fair Value, Recurring [Member]
Securities available for sale (Note 2)		563,364
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities at fair value (Note 2)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale (Note 2)	2,030	2,051
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale (Note 2)	37,361	2,056
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale (Note 2)	475,316	309,945
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Securities available for sale (Note 2)	318,313	246,723
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale (Note 2)	7,342	2,589
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Securities available for sale (Note 2)	2,068
Fair Value, Inputs, Level 3 [Member]
Securities available for sale (Note 2)	13,125
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Securities available for sale (Note 2)		11,423
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]
Equity securities at fair value (Note 2)	1,666	1,485
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale (Note 2)	12,125	10,423
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
Securities available for sale (Note 2)	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale (Note 2)	1,000	$ 1,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Securities available for sale (Note 2)	$ 0

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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