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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Due within one year, amortized cost, available for sale securities	$ 0
Due within one year, fair value, available for sale securities	0
Due within one year, amortized cost, held to maturity securities	905
Due within one year, fair value, held to maturity securities	902
Due after one year through five years, amortized cost, available for sale securities	19,801
Due after one year through five years, fair value, available for sale securities	18,483
Due after one year through five years, amortized cost, held to maturity securities	44,441
Due after one year through five years, fair value, held to maturity securities	43,455
Due after five years through ten years, amortized cost, available for sale securities	39,909
Due after five years through ten years, fair value, available for sale securities	36,498
Due after five years through ten years, amortized cost, held to maturity securities	27,016
Due after five years through ten years, fair value, held to maturity securities	24,481
Due after ten years, amortized cost, available for sale securities	127,116
Due after ten years, fair value, available for sale securities	107,926
Due after ten years, amortized cost, held to maturity securities	80,796
Due after ten years, fair value, held to maturity securities	72,959
Amortized cost, available for sale securities	186,826	$ 82,200	$ 290,058
Fair value, available for sale securities	162,907	$ 74,400	289,495
Amortized cost, held to maturity securities	153,158
Securities, fair value	$ 141,797		$ 33,617

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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 https://asc.fasb.org/extlink&oid=126980459&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126897435&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 https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563

+ Details

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