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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized cost	$ 163,972	$ 218,599
Gross unrealized gains	23	27
Gross unrealized losses	(5,570)	(8,288)
Fair value	158,425	210,338
Certificates of Deposit [Member]
Amortized cost	2,725	2,233
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	2,725	2,233
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	240	240
Gross unrealized gains	0	0
Gross unrealized losses	(11)	(15)
Fair value	229	225
US Treasury Securities [Member]
Amortized cost	128,326	170,906
Gross unrealized gains	0	0
Gross unrealized losses	(5,231)	(7,803)
Fair value	123,095	163,103
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost	28,000	40,000
Gross unrealized gains	0	0
Gross unrealized losses	(137)	(301)
Fair value	27,863	39,699
Residential Mortgage-Backed Securities [Member]
Amortized cost	3,622	3,997
Gross unrealized gains	23	27
Gross unrealized losses	(165)	(143)
Fair value	3,480	3,881
Collateralized Mortgage-Backed Securities [Member]
Amortized cost	1,059	1,223
Gross unrealized gains	0	0
Gross unrealized losses	(26)	(26)
Fair value	$ 1,033	$ 1,197

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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