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Note 3 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2026

Notes Tables

Debt Securities, Held-to-Maturity [Table Text Block]

		June 30, 2026
		Amortized				Gross				Gross
		cost, as				unrealized				unrealized				Estimated
(in thousands)		adjusted				holding gains				holding losses				fair value
Short-term obligations of domestic governmental agencies (maturing between July 2026 and June 2027) (held-to-maturity)		$	69,673			$	5			$	(53	)		$	69,625
Long-term obligations of domestic governmental agencies (maturing between July 2027 and June 2028) (held-to-maturity)			60,005				2				(318	)			59,689
Total held-to-maturity investment securities		$	129,678			$	7			$	(371	)		$	129,314

		December 31, 2025
		Amortized				Gross				Gross
		cost, as				unrealized				unrealized				Estimated
(in thousands)		adjusted				holding gains				holding losses				fair value
Short-term obligations of domestic governmental agencies (maturing between January 2026 and December 2026) (held-to-maturity)		$	62,822			$	130			$	—			$	62,952
Long-term obligations of domestic governmental agencies (maturing between January 2027 and November 2027) (held-to-maturity)			57,541				201				—				57,742
Total held-to-maturity investment securities		$	120,363			$	331			$	—			$	120,694

X

- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 50
-Paragraph 5B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 50
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Paragraph 5
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-Publisher FASB
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 16: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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-Section 50
-Paragraph 5A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A

Reference 18: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
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