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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Due within one year, amortized cost, available for sale securities	$ 765
Due within one year, fair value, available for sale securities	766
Due within one year, amortized cost, held to maturity securities	2,410
Due within one year, fair value, held to maturity securities	2,412
Due after one year through five years, amortized cost, available for sale securities	37,128
Due after one year through five years, fair value, available for sale securities	37,119
Due after one year through five years, amortized cost, held to maturity securities	2,332
Due after one year through five years, fair value, held to maturity securities	2,415
Due after five years through ten years, amortized cost, available for sale securities	65,837
Due after five years through ten years, fair value, available for sale securities	66,087
Due after five years through ten years, amortized cost, held to maturity securities	6,288
Due after five years through ten years, fair value, held to maturity securities	6,362
Due after ten years, amortized cost, available for sale securities	186,328
Due after ten years, fair value, available for sale securities	185,523
Due after ten years, amortized cost, held to maturity securities	22,411
Due after ten years, fair value, held to maturity securities	22,428
Amortized cost, available for sale securities	290,058		$ 136,355
Fair value, available for sale securities	289,495	$ 289,495	140,225
Amortized cost, held to maturity securities	33,441
Securities, fair value	$ 33,617	$ 33,617	$ 14,743

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Period Type:	instant

X

- 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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Data Type:	xbrli:monetaryItemType
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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=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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