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Note 10 - Capital Resources - Outstanding Junior Subordinated Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	May 31, 2014
Junior subordinated debt	$ 119,136	$ 119,136	$ 119,100,000
Cathay Capital Trust I [Member]
Junior subordinated debt	$ 20,619	$ 20,619
current interest rate	8.02%	8.81%
Cathay Capital Trust I [Member] | Secured Overnight Financing Rate (SOFR) [Member]
coupon rate	3.15%	3.15%
Cathay Capital Trust I [Member] | Adjustment to SOFR [Member]
coupon rate	0.26161%	0.26161%
Cathay Statutory Trust I [Member]
Junior subordinated debt	$ 20,619	$ 20,619
current interest rate	8.20%	8.67%
Cathay Statutory Trust I [Member] | Secured Overnight Financing Rate (SOFR) [Member]
coupon rate	3.00%	3.00%
Cathay Statutory Trust I [Member] | Adjustment to SOFR [Member]
coupon rate	0.26161%	0.26161%
Cathay Capital Trust II [Member]
Junior subordinated debt	$ 12,887	$ 12,887
current interest rate	7.77%	8.56%
Cathay Capital Trust II [Member] | Secured Overnight Financing Rate (SOFR) [Member]
coupon rate	2.90%	2.90%
Cathay Capital Trust II [Member] | Adjustment to SOFR [Member]
coupon rate	0.26161%	0.26161%
Cathay Capital Trust III [Member]
Junior subordinated debt	$ 46,392	$ 46,392
current interest rate	6.69%	7.15%
Cathay Capital Trust III [Member] | Secured Overnight Financing Rate (SOFR) [Member]
coupon rate	1.48%	1.48%
Cathay Capital Trust III [Member] | Adjustment to SOFR [Member]
coupon rate	0.26161%	0.26161%
Cathay Capital Trust IV [Member]
Junior subordinated debt	$ 18,619	$ 18,619
current interest rate	6.66%	7.06%
Cathay Capital Trust IV [Member] | Secured Overnight Financing Rate (SOFR) [Member]
coupon rate	1.40%	1.40%
Cathay Capital Trust IV [Member] | Adjustment to SOFR [Member]
coupon rate	0.26161%	0.26161%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The average effective interest rate during the reporting period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Section 50
-Paragraph 1F
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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