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Note 12 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair value, available for sale securities	$ 159,742	$ 140,225	[1]
Fair Value, Recurring [Member]
Fair value, available for sale securities	159,742	140,225
Derivatives - cash flow hedges	1,365	431
Assets, Fair Value	161,107	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities
Derivatives - cash flow hedges
Assets, Fair Value
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	159,742	140,225
Derivatives - cash flow hedges	1,365	431
Assets, Fair Value	161,107	140,656
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities
Derivatives - cash flow hedges
Assets, Fair Value
US Agency and Mortgage-backed Securities [Member]
Fair value, available for sale securities	109,339	101,598
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	109,339	101,598
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	109,339	101,598
US Agency and Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities
Municipal Bonds [Member]
Fair value, available for sale securities	50,403	38,627
Municipal Bonds [Member] | Fair Value, Recurring [Member]
Fair value, available for sale securities	50,403	38,627
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	50,403	38,627
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities
[1] Derived from audited consolidated financial statements.

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)
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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))
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-Name Accounting Standards Codification
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB
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-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-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
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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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-Section 55
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