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Disclosure - Note 3 - Fair Value Measurements (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-tables Note 3 - Fair Value Measurements (Tables) Tables http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements 35 false false R36.htm 995577 - Disclosure - Note 4 - Investment Securities (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-4-investment-securities-tables Note 4 - Investment Securities (Tables) Tables http://plumasbank.com/20251231/role/statement-note-4-investment-securities 36 false false R37.htm 995578 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-tables Note 5 - Loans and the Allowance for Credit Losses (Tables) Tables http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses 37 false false R38.htm 995579 - Disclosure - Note 6 - Premises and Equipment (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-6-premises-and-equipment-tables Note 6 - 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Disclosure - Note 12 - Commitments and Contingencies (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-12-commitments-and-contingencies-tables Note 12 - Commitments and Contingencies (Tables) Tables http://plumasbank.com/20251231/role/statement-note-12-commitments-and-contingencies 42 false false R43.htm 995584 - Disclosure - Note 13 - Shareholders' Equity (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-13-shareholders-equity-tables Note 13 - Shareholders' Equity (Tables) Tables http://plumasbank.com/20251231/role/statement-note-13-shareholders-equity 43 false false R44.htm 995585 - Disclosure - Note 14 - Other Expenses (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-14-other-expenses-tables Note 14 - Other Expenses (Tables) Tables http://plumasbank.com/20251231/role/statement-note-14-other-expenses 44 false false R45.htm 995586 - Disclosure - Note 15 - Income Taxes (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-15-income-taxes-tables Note 15 - Income Taxes (Tables) Tables http://plumasbank.com/20251231/role/statement-note-15-income-taxes 45 false false R46.htm 995587 - Disclosure - Note 16 - Related Party Transactions (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-16-related-party-transactions-tables Note 16 - Related Party Transactions (Tables) Tables http://plumasbank.com/20251231/role/statement-note-16-related-party-transactions 46 false false R47.htm 995588 - Disclosure - Note 18 - Comprehensive Income (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-18-comprehensive-income-tables Note 18 - Comprehensive Income (Tables) Tables http://plumasbank.com/20251231/role/statement-note-18-comprehensive-income 47 false false R48.htm 995589 - Disclosure - Note 19 - Business Combinations - Acquisition of Conerstone Community Bancorp (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-19-business-combinations-acquisition-of-conerstone-community-bancorp-tables Note 19 - Business Combinations - Acquisition of Conerstone Community Bancorp (Tables) Tables http://plumasbank.com/20251231/role/statement-note-19-business-combinations-acquisition-of-conerstone-community-bancorp 48 false false R49.htm 995590 - Disclosure - Note 20 - Parent Only Condensed Financial Statements (Tables) Sheet http://plumasbank.com/20251231/role/statement-note-20-parent-only-condensed-financial-statements-tables Note 20 - Parent Only Condensed Financial Statements (Tables) Tables http://plumasbank.com/20251231/role/statement-note-20-parent-only-condensed-financial-statements 49 false false R50.htm 995591 - Disclosure - Note 1 - The Business of Plumas Bancorp (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-1-the-business-of-plumas-bancorp-details-textual Note 1 - The Business of Plumas Bancorp (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-1-the-business-of-plumas-bancorp 50 false false R51.htm 995592 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-details-textual Note 2 - Summary of Significant Accounting Policies (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-tables 51 false false R52.htm 995593 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Reconciliation of Purchase Price to Par Value (Details) Sheet http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-reconciliation-of-purchase-price-to-par-value-details Note 2 - Summary of Significant Accounting Policies - Reconciliation of Purchase Price to Par Value (Details) Details 52 false false R53.htm 995594 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Change in Other Real Estate (Details) Sheet http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-change-in-other-real-estate-details Note 2 - Summary of Significant Accounting Policies - Change in Other Real Estate (Details) Details 53 false false R54.htm 995595 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) Sheet http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-intangible-assets-details Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) Details 54 false false R55.htm 995596 - Disclosure - Note 2 -Summary of Significant Accounting Policies - Weighted Average Fair Value Assumptions (Details) Sheet http://plumasbank.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-weighted-average-fair-value-assumptions-details Note 2 -Summary of Significant Accounting Policies - Weighted Average Fair Value Assumptions (Details) Details 55 false false R56.htm 995597 - Disclosure - Note 3 - Fair Value Measurements (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-details-textual Note 3 - Fair Value Measurements (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-tables 56 false false R57.htm 995598 - Disclosure - Note 3 - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-carrying-amounts-and-estimated-fair-values-of-financial-instruments-details Note 3 - Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Details 57 false false R58.htm 995599 - Disclosure - Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-assets-and-liabilities-measured-at-fair-value-on-a-recurring-basis-details Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Details 58 false false R59.htm 995600 - Disclosure - Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-assets-and-liabilities-measured-at-fair-value-on-a-nonrecurring-basis-details Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) Details 59 false false R60.htm 995601 - Disclosure - Note 3 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) Sheet http://plumasbank.com/20251231/role/statement-note-3-fair-value-measurements-quantitative-information-about-level-3-fair-value-measurements-for-financial-instruments-measured-at-fair-value-on-a-nonrecurring-basis-details Note 3 - Fair Value Measurements - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) Details 60 false false R61.htm 995602 - Disclosure - Note 4 - Investment Securities (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-4-investment-securities-details-textual Note 4 - Investment Securities (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-4-investment-securities-tables 61 false false R62.htm 995603 - Disclosure - Note 4 - Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Details) Sheet http://plumasbank.com/20251231/role/statement-note-4-investment-securities-amortized-cost-and-estimated-fair-value-of-investment-securities-details Note 4 - Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Details) Details 62 false false R63.htm 995604 - Disclosure - Note 4 - Investment Securities - Investment Securities With Unrealized Losses (Details) Sheet http://plumasbank.com/20251231/role/statement-note-4-investment-securities-investment-securities-with-unrealized-losses-details Note 4 - Investment Securities - Investment Securities With Unrealized Losses (Details) Details 63 false false R64.htm 995605 - Disclosure - Note 4 - Investment Securities - Investment Securities by Contractual Maturity (Details) Sheet http://plumasbank.com/20251231/role/statement-note-4-investment-securities-investment-securities-by-contractual-maturity-details Note 4 - Investment Securities - Investment Securities by Contractual Maturity (Details) Details 64 false false R65.htm 995606 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-details-textual Note 5 - Loans and the Allowance for Credit Losses (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-tables 65 false false R66.htm 995607 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-outstanding-loans-details Note 5 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) Details 66 false false R67.htm 995608 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Loan Portfolio Allocated by Internal Risk Ratings (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-loan-portfolio-allocated-by-internal-risk-ratings-details Note 5 - Loans and the Allowance for Credit Losses - Loan Portfolio Allocated by Internal Risk Ratings (Details) Details 67 false false R68.htm 995609 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Balance of Nonaccrual Loans By Loan Category (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-balance-of-nonaccrual-loans-by-loan-category-details Note 5 - Loans and the Allowance for Credit Losses - Balance of Nonaccrual Loans By Loan Category (Details) Details 68 false false R69.htm 995610 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Reversal of Accrued Interest (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-reversal-of-accrued-interest-details Note 5 - Loans and the Allowance for Credit Losses - Reversal of Accrued Interest (Details) Details 69 false false R70.htm 995611 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-collateral-dependent-loans-details Note 5 - Loans and the Allowance for Credit Losses - Collateral Dependent Loans (Details) Details 70 false false R71.htm 995612 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Loan Modifications (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-loan-modifications-details Note 5 - Loans and the Allowance for Credit Losses - Loan Modifications (Details) Details 71 false false R72.htm 995613 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-financial-effect-of-loan-modifications-details Note 5 - Loans and the Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) Details 72 false false R73.htm 995614 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-aging-analysis-of-the-loan-portfolio-details Note 5 - Loans and the Allowance for Credit Losses - Aging Analysis of the Loan Portfolio (Details) Details 73 false false R74.htm 995615 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Allocation of the Allowance for Credit Losses (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-allocation-of-the-allowance-for-credit-losses-details Note 5 - Loans and the Allowance for Credit Losses - Allocation of the Allowance for Credit Losses (Details) Details 74 false false R75.htm 995616 - Disclosure - Note 5 - Loans and the Allowance for Credit Losses - Reserve for Unfunded Commitments (Details) Sheet http://plumasbank.com/20251231/role/statement-note-5-loans-and-the-allowance-for-credit-losses-reserve-for-unfunded-commitments-details Note 5 - Loans and the Allowance for Credit Losses - Reserve for Unfunded Commitments (Details) Details 75 false false R76.htm 995617 - Disclosure - Note 6 - Premises and Equipment (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-6-premises-and-equipment-details-textual Note 6 - Premises and Equipment (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-6-premises-and-equipment-tables 76 false false R77.htm 995618 - Disclosure - Note 6 - Premises and Equipment - Premises and Equipment (Details) Sheet http://plumasbank.com/20251231/role/statement-note-6-premises-and-equipment-premises-and-equipment-details Note 6 - Premises and Equipment - Premises and Equipment (Details) Details 77 false false R78.htm 995619 - Disclosure - Note 7 - Deposits (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-7-deposits-details-textual Note 7 - Deposits (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-7-deposits-tables 78 false false R79.htm 995620 - Disclosure - Note 7 - Deposits - Interest-bearing Deposits (Details) Sheet http://plumasbank.com/20251231/role/statement-note-7-deposits-interestbearing-deposits-details Note 7 - Deposits - Interest-bearing Deposits (Details) Details 79 false false R80.htm 995621 - Disclosure - Note 7 - Deposits - Maturities of Time Deposits (Details) Sheet http://plumasbank.com/20251231/role/statement-note-7-deposits-maturities-of-time-deposits-details Note 7 - Deposits - Maturities of Time Deposits (Details) Details 80 false false R81.htm 995622 - Disclosure - Note 8 - Securities Sold Under Agreements to Repurchase (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-8-securities-sold-under-agreements-to-repurchase-details-textual Note 8 - Securities Sold Under Agreements to Repurchase (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-8-securities-sold-under-agreements-to-repurchase-tables 81 false false R82.htm 995623 - Disclosure - Note 8 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) Sheet http://plumasbank.com/20251231/role/statement-note-8-securities-sold-under-agreements-to-repurchase-securities-sold-under-agreements-to-repurchase-details Note 8 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) Details 82 false false R83.htm 995624 - Disclosure - Note 9 - Borrowing Arrangements (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-9-borrowing-arrangements-details-textual Note 9 - Borrowing Arrangements (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-9-borrowing-arrangements- 83 false false R84.htm 995625 - Disclosure - Note 10 - Subordinated Debentures (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-10-subordinated-debentures-details-textual Note 10 - Subordinated Debentures (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-10-subordinated-debentures 84 false false R85.htm 995626 - 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Financial Instruments Representing Off-balance-sheet Credit Risk (Details) Sheet http://plumasbank.com/20251231/role/statement-note-12-commitments-and-contingencies-financial-instruments-representing-offbalancesheet-credit-risk-details Note 12 - Commitments and Contingencies - Financial Instruments Representing Off-balance-sheet Credit Risk (Details) Details 88 false false R89.htm 995630 - Disclosure - Note 13 - Shareholders' Equity (Details Textual) Sheet http://plumasbank.com/20251231/role/statement-note-13-shareholders-equity-details-textual Note 13 - Shareholders' Equity (Details Textual) Details http://plumasbank.com/20251231/role/statement-note-13-shareholders-equity-tables 89 false false R90.htm 995631 - Disclosure - Note 13 - Shareholders' Equity - Basic and Diluted Earnings Per Share (Details) Sheet http://plumasbank.com/20251231/role/statement-note-13-shareholders-equity-basic-and-diluted-earnings-per-share-details Note 13 - Shareholders' Equity - Basic and Diluted Earnings Per Share (Details) Details 90 false false R91.htm 995632 - 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Qualified Affordable Housing Projects (Details) Sheet http://plumasbank.com/20251231/role/statement-note-15-income-taxes-qualified-affordable-housing-projects-details Note 15 - Income Taxes - Qualified Affordable Housing Projects (Details) Details 98 false false R99.htm 995640 - Disclosure - Note 15 - Income Taxes - Qualified Affordable Housing Projects (Details) (Parentheticals) Sheet http://plumasbank.com/20251231/role/statement-note-15-income-taxes-qualified-affordable-housing-projects-details-parentheticals Note 15 - Income Taxes - Qualified Affordable Housing Projects (Details) (Parentheticals) Details 99 false false R100.htm 995641 - Disclosure - Note 15 - Income Taxes - Income Tax Rate Reconciliation (Details) Sheet http://plumasbank.com/20251231/role/statement-note-15-income-taxes-income-tax-rate-reconciliation-details Note 15 - Income Taxes - Income Tax Rate Reconciliation (Details) Details 100 false false R101.htm 995642 - Disclosure - Note 15 - Income Taxes - Schedule of Income Taxes Paid (Details) Sheet http://plumasbank.com/20251231/role/statement-note-15-income-taxes-schedule-of-income-taxes-paid-details Note 15 - 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