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Note 2 - Summary of Significant Accounting Policies (Details Textual) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 shares
Business Combination, Acquisition-Related Cost, Expense | $ 1,900,000 |  | $ 1,963,000 | $ 0 | $ 0 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss |  |  | 0 | 0 |  |
Debt Securities, Trading |  |  | 0 | 0 |  |
Federal Home Loan Bank Stock |  |  | 8,084,000 | 6,234,000 |  |
Federal Reserve Bank Stock |  |  | 3,565,000 | 1,380,000 |  |
Real Estate Acquired Through Foreclosure |  |  | $ 226,000 | $ 91,000 |  |
Number of Mortgage Loans in Process of Foreclosure |  |  | 1 | 1 |  |
Mortgage Loans in Process of Foreclosure, Amount |  |  | $ 2,000,000 | $ 53,000 |  |
Proceeds from Sale of Other Real Estate |  |  | 22,000 | 362,000 | 122,000 |
Gains (Losses) on Sales of Other Real Estate |  |  | (0) | 5,000 | 39,000 |
Amortization of Intangible Assets |  |  | 1,300,000 | 201,000 | 237,000 |
Finite-Lived Intangible Asset, Expected Amortization, Year One |  |  | 2,235,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two |  |  | 1,990,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three |  |  | 1,742,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four |  |  | 1,479,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five |  |  | 1,244,000 |  |  |
Goodwill |  |  | 24,215,000 | 5,502,000 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  |  | 5,811,000 | 19,817,000 | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  |  | (1,718,000) | (5,858,000) | (0) |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax |  |  | 254,000 | 0 | 0 |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, Tax |  |  | 75,000 | (0) | (0) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  |  | (5,811,000) | (19,817,000) | 1,707,000 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax |  |  | (1,718,000) | (5,858,000) | 505,000 |
Share-Based Payment Arrangement, Expense, after Tax |  |  | $ 320,000 | $ 450,000 | $ 300,000 |
Allocated Share Based Compensation Expense Net of Tax Per Diluted Share (in dollars per share) | $ / shares |  |  | $ 0.05 | $ 0.08 | $ 0.05 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | shares |  |  | 30,803 | 107,200 | 0 |
Restricted Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 0 | 435 | 0 | 1,650
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares |  |  | 0 | 3,033 | 0 |
Feather River Bancorp, Inc. [Member] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 0 | $ 0 | $ 0 |
Core Deposits [Member] |  |  |  |  |  |
Amortization of Intangible Assets |  |  | $ 1,300,000 | $ 201,000 | $ 237,000 |
Other Real Estate, Residential Real Estate [Member] |  |  |  |  |  |
Number of Real Estate Properties |  |  | 2 | 1 |  |
Cornerstone Community Bancorp [Member] |  |  |  |  |  |
Business Combination, Acquisition-Related Cost, Expense |  | $ 6,400,000 |  |  |  |
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Fair Value | 432,000,000 |  |  |  |  |
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Gross Contractual Amount | 579,000,000 |  |  |  |  |
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Contractual Cash Flow, Estimated Uncollectible | 6,700,000 |  |  |  |  |
Goodwill | $ 18,713,000 |  |  |  |  |
Cornerstone Community Bancorp [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 10 years |  |  |  |  |
Feather River Bancorp, Inc. [Member] |  |  |  |  |  |
Goodwill | $ 18,713,000 |  |  |  |  |
Feather River Bancorp, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 10 years |  |
Minimum [Member] | Building [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 20 years |  |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 2 years |  |  |
Maximum [Member] | Building [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 30 years |  |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 10 years |  |  |
SBA, RBS and FSA [Member] | Minimum [Member] |  |  |  |  |  |
Loans Held-for-sale, Percent Guaranteed |  |  | 75.00% |  |  |
SBA, RBS and FSA [Member] | Maximum [Member] |  |  |  |  |  |
Loans Held-for-sale, Percent Guaranteed |  |  | 90.00% |  |  |
SBA [Member] |  |  |  |  |  |
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance |  |  | $ 0 | $ 0 |  |
Guaranteed Loans With Unpaid Balance |  |  | $ 83,668,000,000 | $ 95,332,000 |  |

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