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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities available for sale, amortized cost	$ 297,291	$ 320,123
Securities available for sale, unrealized gains	0	24
Securities available for sale, unrealized losses	(21,959)	(19,798)
Securities available for sale, fair value	275,332	300,349	[1]
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost	5,750	1,500
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(9)	(15)
Securities available for sale, fair value	5,741	1,485
US Treasury Securities [Member]
Securities available for sale, amortized cost	146,929	161,617
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(2,009)	(4,353)
Securities available for sale, fair value	144,920	157,264
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, amortized cost	19,951	23,480
Securities available for sale, unrealized gains	0	21
Securities available for sale, unrealized losses	(550)	(192)
Securities available for sale, fair value	19,401	23,309
Corporate Debt Securities [Member]
Securities available for sale, amortized cost	28,559	37,046
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(2,310)	(2,189)
Securities available for sale, fair value	26,249	34,857
Mortgage-backed Agency Securities [Member]
Securities available for sale, amortized cost	96,102	96,480
Securities available for sale, unrealized gains	0	3
Securities available for sale, unrealized losses	(17,081)	(13,049)
Securities available for sale, fair value	$ 79,021	$ 83,434
[1] Derived from audited financial statements

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
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-Publisher FASB
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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
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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))
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Amount 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 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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-Paragraph 1
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