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Note 17 - Fair Value Measurements - Summary of Quantitative Information About Impaired Loans and OREO Non-recurring Level 3 Fair Value Measurements (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Assets measured at fair value		$ 126,069
Fair Value, Nonrecurring [Member]
Assets measured at fair value	$ 293
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member]
Assets measured at fair value	$ 293	$ 293
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member]
Adjustment	0.05	0.05
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member]
Adjustment	0.06	0.06

X

- Definition

Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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