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Note 19 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair value, available for sale securities	$ 140,225	$ 120,983
Fair Value, Recurring [Member]
Fair value, available for sale securities	140,225	120,983
Derivatives - cash flow hedges	431
Assets, Fair Value	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0
Assets, Fair Value	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	140,225	120,983
Derivatives - cash flow hedges	431
Assets, Fair Value	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0
Assets, Fair Value	0
US Agency and Mortgage-backed Securities [Member]
Fair value, available for sale securities	101,598	94,905
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	101,598	94,905
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	101,598	94,905
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Municipal Bonds [Member]
Fair value, available for sale securities	38,627	26,078
Municipal Bonds [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	38,627	26,078
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	38,627	26,078
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- 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))
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-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-Name Accounting Standards Codification
-Topic 320
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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-Section 55
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