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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Due within one year, amortized cost, available for sale securities	$ 2,765
Due within one year, fair value, available for sale securities	2,781
Due within one year, amortized cost, held to maturity securities	2,410
Due within one year, fair value, held to maturity securities	2,418
Due after one year through five years, amortized cost, available for sale securities	15,905
Due after one year through five years, fair value, available for sale securities	16,002
Due after one year through five years, amortized cost, held to maturity securities	2,335
Due after one year through five years, fair value, held to maturity securities	2,432
Due after five years through ten years, amortized cost, available for sale securities	62,654
Due after five years through ten years, fair value, available for sale securities	63,525
Due after five years through ten years, amortized cost, held to maturity securities	1,552
Due after five years through ten years, fair value, held to maturity securities	1,599
Due after ten years, amortized cost, available for sale securities	184,139
Due after ten years, fair value, available for sale securities	184,292
Due after ten years, amortized cost, held to maturity securities	3,749
Due after ten years, fair value, held to maturity securities	3,813
Amortized cost, available for sale securities	265,463	$ 136,355
Fair value, available for sale securities	266,600	140,225	[1]
Amortized cost, held to maturity securities	10,046
Securities, fair value	$ 10,262	$ 14,743	[1]
[1] Derived from audited consolidated financial statements.

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563

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