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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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- Definition The average effective interest rate during the reporting period. + References 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 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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- Definition 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 + Details
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