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Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities	$ 170,239	$ 210,338
Certificates of Deposit [Member]
Securities	2,977	2,233
US States and Political Subdivisions Debt Securities [Member]
Securities	227	225
US Treasury and Government [Member]
Securities	122,365
US Government-sponsored Enterprises Debt Securities [Member]
Securities	39,739	39,699
Residential Mortgage-Backed Securities [Member]
Securities	3,781	3,881
Collateralized Mortgage-Backed Securities [Member]
Securities	1,150	1,197
US Treasury Securities [Member]
Securities	122,365	163,103
Fair Value, Inputs, Level 1 [Member]
Securities	122,365	163,103
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
Securities	122,365
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Securities		163,103
Fair Value, Inputs, Level 2 [Member]
Securities	47,874	47,235
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Securities	2,977	2,233
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	227	225
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	39,739	39,699
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	3,781	3,881
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	1,150	1,197
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Securities		0
Fair Value, Inputs, Level 3 [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	$ 0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Securities		$ 0

X

- Definition

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
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-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

+ Details

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