000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Statements of Net Assets Available for Benefits link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Statement of Changes in Net Assets Available for Benefits link:calculationLink link:definitionLink link:presentationLink 003 - Disclosure - Note 1 - Description of Plan link:calculationLink link:definitionLink link:presentationLink 004 - Disclosure - Note 2 - Summary of Accounting Policies link:calculationLink link:definitionLink link:presentationLink 005 - Disclosure - Note 3 - Investment in Westamerica Bancorporation Common Stock link:calculationLink link:definitionLink link:presentationLink 006 - Disclosure - Note 4 - Fair Value Measurements link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note 5 - Federal Income Tax Status link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 6 - Party-in-interest Transactions link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 7 - Reconciliation of Financial Statements to Form 5500 link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Schedule H - Line 4(i) link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 3 - Investment in Westamerica Bancorporation Common Stock (Tables) link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 4 - Fair Value Measurements (Tables) link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 7 - Reconciliation of Financial Statements to Form 5500 (Tables) link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Schedule H - Line 4(i) (Tables) link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 1 - Description of Plan (Details Textual) link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 3 - Investment in Westamerica Bancorporation Common Stock (Details Textual) link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 3 - Investment in Westamerica Bancorporation Common Stock - Investments (Details) link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 4 - Fair Value Measurements (Details Textual) link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 4 - Fair Value Measurements - Plan Assets (Details) link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 5 - Federal Income Tax Status (Details Textual) link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 6 - Party-in-interest Transactions (Details Textual) link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 7 - Reconciliation of Financial Statements to Form 5500 - Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Schedule H - Line 4(i) (Details Textual) link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Schedule H - Line 4(i) - Schedule of Assets (Details) link:calculationLink link:definitionLink link:presentationLink 026 - Disclosure - Schedule H - Line 4(i) - Schedule of Assets 2 (Details) link:calculationLink link:definitionLink link:presentationLink