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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands

Mar. 31, 2021

Dec. 31, 2020

Due within one year, amortized cost, available for sale securities

$ 2,345

Due within one year, fair value, available for sale securities

2,378

Due within one year, amortized cost, held to maturity securities

391

Due within one year, fair value, held to maturity securities

392

Due after one year through five years, amortized cost, available for sale securities

8,892

Due after one year through five years, fair value, available for sale securities

9,192

Due after one year through five years, amortized cost, held to maturity securities

6,040

Due after one year through five years, fair value, held to maturity securities

6,251

Due after five years through ten years, amortized cost, available for sale securities

44,696

Due after five years through ten years, fair value, available for sale securities

45,378

Due after five years through ten years, amortized cost, held to maturity securities

2,107

Due after five years through ten years, fair value, held to maturity securities

2,176

Due after ten years, amortized cost, available for sale securities

102,033

Due after ten years, fair value, available for sale securities

102,794

Due after ten years, amortized cost, held to maturity securities

4,886

Due after ten years, fair value, held to maturity securities

5,024

Amortized cost, available for sale securities

157,966

$ 136,355

Fair value, available for sale securities

159,742

140,225

^[1]

Amortized cost, held to maturity securities

13,424

Securities, fair value

$ 13,843

$ 14,743

^[2]

[1]	Derived from audited consolidated financial statements.
[2]	Derived from audited consolidated financial statements.

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Amount 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=120252992&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=121645371&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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=121645371&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=121645371&loc=SL120269820-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant