Note 1 - General and Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2026
us-gaap_DisclosureTextBlockAbstract
Significant Accounting Policies [Text Block]	Note 1: General and Summary of Significant Accounting Policies The consolidated financial statements of National Bankshares, Inc. (“NBI”) and its wholly-owned subsidiaries, The National Bank of Blacksburg (the “Bank” or “NBB”) and National Bankshares Financial Services, Inc. (“NBFS”) (collectively, the “Company”), conform to accounting principles generally accepted in the United States of America (“GAAP”) and to general practices within the banking industry. All intercompany accounts and transactions between the Company and its subsidiaries have been eliminated. The accompanying interim period consolidated financial statements are unaudited; however, in the opinion of the Company’s management, all adjustments consisting of normal recurring adjustments, which are necessary for a fair presentation of the consolidated financial statements, have been included. Application of the principles of GAAP and practices within the banking industry require management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statement; accordingly, as this information changes, the financial statements may reflect different estimates, assumptions, and judgments. Certain policies inherently rely more extensively on the use of estimates, assumptions, and judgments and as such may have a greater possibility of producing results that could be materially different than originally reported. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses on loans and pension plan. The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of results of operations for the full year or any other interim period. The interim period consolidated financial statements and financial information included in this Form 10-Q should be read in conjunction with the notes to consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (“2025 Form 10-K”). The Company’s significant accounting policies followed in preparation of the unaudited consolidated financial statements are disclosed in Note 1 of the Company's 2025 Form 10-K. All amounts and disclosures included in this quarterly report as of December 31, 2025, were derived from the Company’s audited consolidated financial statements. Certain items in the prior period financial statements have been reclassified to conform to the current presentation. These reclassifications had no effect on prior year net income or stockholders’ equity. The Company posts all reports required to be filed under the Securities Exchange Act of 1934 on its web site at www.nationalbankshares.com. Risks and Uncertainties The Company is closely monitoring risks that may impact its business, including inflation, along with U.S. monetary policy maneuvers to manage inflation. Inflation and U.S. monetary policy maneuvers to reduce it may impact the Company’s customers’ demand for banking services and ability to qualify for and/or repay loans. These risks could adversely affect the Company’s business, financial condition, results of operations, cash flows, credit risk, asset valuations and capital position. Recent Accounting Pronouncements ASU 2025-08 In November 2025, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) 2025-08,“Financial Instruments—Credit Losses (Topic 326): Purchased Loans.” The amendments in this ASU expand the population of acquired financial assets accounted for using the gross-up approach. Acquired loans (excluding credit cards) are deemed purchased seasoned loans and accounted for using the gross-up approach upon acquisition if criteria established by the new guidance are met. This change aims to enhance comparability, consistency, and better reflect the economics of acquiring financial assets. This ASU is effective for annual reporting periods beginning after December 15, 2026, and for interim reporting periods within those annual reporting periods. Early adoption is permitted in an interim or annual reporting period in which financial statements have not yet been issued or made available for issuance. If an entity adopts this ASU in an interim reporting period, it should apply it as of the beginning of that interim reporting period or the beginning of the annual reporting period that includes that interim reporting period. The Company does not expect the adoption of ASU 2025-08 to have a material impact on its consolidated financial statements at the time of adoption; however, is considering the impacts to future acquisition activity. ASU 2024-03 In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specified information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. The FASB subsequently issued ASU 2025-01, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date”, which amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in ASU 2024-03 in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU 2024-03 is permitted. The Company does not expect the adoption of ASU 2024-03 to have a material impact on its consolidated financial statements.

Note 1 - General and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2026

Significant Accounting Policies [Text Block]

Note 1: General and Summary of Significant Accounting Policies

The consolidated financial statements of National Bankshares, Inc. (“NBI”) and its wholly-owned subsidiaries, The National Bank of Blacksburg (the “Bank” or “NBB”) and National Bankshares Financial Services, Inc. (“NBFS”) (collectively, the “Company”), conform to accounting principles generally accepted in the United States of America (“GAAP”) and to general practices within the banking industry. All intercompany accounts and transactions between the Company and its subsidiaries have been eliminated. The accompanying interim period consolidated financial statements are unaudited; however, in the opinion of the Company’s management, all adjustments consisting of normal recurring adjustments, which are necessary for a fair presentation of the consolidated financial statements, have been included.

Application of the principles of GAAP and practices within the banking industry require management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statement; accordingly, as this information changes, the financial statements may reflect different estimates, assumptions, and judgments. Certain policies inherently rely more extensively on the use of estimates, assumptions, and judgments and as such may have a greater possibility of producing results that could be materially different than originally reported. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses on loans and pension plan.

The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of results of operations for the full year or any other interim period. The interim period consolidated financial statements and financial information included in this Form 10-Q should be read in conjunction with the notes to consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (“2025 Form 10-K”). The Company’s significant accounting policies followed in preparation of the unaudited consolidated financial statements are disclosed in Note 1 of the Company's 2025 Form 10-K. All amounts and disclosures included in this quarterly report as of December 31, 2025, were derived from the Company’s audited consolidated financial statements. Certain items in the prior period financial statements have been reclassified to conform to the current presentation. These reclassifications had no effect on prior year net income or stockholders’ equity. The Company posts all reports required to be filed under the Securities Exchange Act of 1934 on its web site at www.nationalbankshares.com.

Risks and Uncertainties

The Company is closely monitoring risks that may impact its business, including inflation, along with U.S. monetary policy maneuvers to manage inflation. Inflation and U.S. monetary policy maneuvers to reduce it may impact the Company’s customers’ demand for banking services and ability to qualify for and/or repay loans. These risks could adversely affect the Company’s business, financial condition, results of operations, cash flows, credit risk, asset valuations and capital position.

Recent Accounting Pronouncements

ASU 2025-08

In November 2025, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) 2025-08,“Financial Instruments—Credit Losses (Topic 326): Purchased Loans.” The amendments in this ASU expand the population of acquired financial assets accounted for using the gross-up approach. Acquired loans (excluding credit cards) are deemed purchased seasoned loans and accounted for using the gross-up approach upon acquisition if criteria established by the new guidance are met. This change aims to enhance comparability, consistency, and better reflect the economics of acquiring financial assets. This ASU is effective for annual reporting periods beginning after December 15, 2026, and for interim reporting periods within those annual reporting periods. Early adoption is permitted in an interim or annual reporting period in which financial statements have not yet been issued or made available for issuance. If an entity adopts this ASU in an interim reporting period, it should apply it as of the beginning of that interim reporting period or the beginning of the annual reporting period that includes that interim reporting period. The Company does not expect the adoption of ASU 2025-08 to have a material impact on its consolidated financial statements at the time of adoption; however, is considering the impacts to future acquisition activity.

ASU 2024-03

In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specified information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense

captions that are not separately disaggregated quantitatively. The FASB subsequently issued ASU 2025-01, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date”, which amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in ASU 2024-03 in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU 2024-03 is permitted. The Company does not expect the adoption of ASU 2024-03 to have a material impact on its consolidated financial statements.