Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements include the accounts of BIO-key and include all normal and recurring adjustments which are necessary for a fair presentation in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim consolidated financial statements and Rule 8-03 of Regulation S-X promulgated by the Securities and Exchange Commission (the “SEC”). The operating results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the full year ended December 31, 2025. Pursuant to such rules and regulations, certain financial information and footnote disclosures normally included in the financial statements have been condensed or omitted. Intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all necessary adjustments, consisting only of those of a recurring nature, and disclosures to present fairly the Company’s financial position and the results of its operations and cash flows for the periods presented. These unaudited interim condensed consolidated financial statements should be read in conjunction with the financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on April 23, 2025, from which the accompanying condensed consolidated balance sheet dated December 31, 2024 was derived.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currencies The Company accounts for foreign currency transactions pursuant to Accounting Standards Codification ("ASC") 830, Foreign Currency Matters (“ASC 830”). The functional currency of the Company is the U.S. dollar, which is the currency of the primary economic environment in which it operates. In accordance with ASC 830, all assets and liabilities are translated into U. S. dollars using the current exchange rate at the end of each fiscal period. Revenues and expenses are translated using the average exchange rates prevailing throughout the respective periods. All transaction gains and losses from the measurement of monetary balance sheet items denominated in Euros are reflected in the statement of operations as appropriate. Translation adjustments are included in accumulated other comprehensive income (loss).
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements Effective January 1, 2024, the Company adopted ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06”) to simplify accounting for certain financial instruments. ASU 2020-06 eliminates the current models that require separation of beneficial conversion and cash conversion features from convertible instruments and simplifies the derivative scope exception guidance pertaining to equity classification of contracts in an entity’s own equity. The new standard also introduces additional disclosures for convertible debt and freestanding instruments that are indexed to and settled in an entity’s own equity. ASU 2020-06 amends the diluted earnings per share guidance, including the requirement to use the if-converted method for all convertible instruments. The adoption of ASU 2020-06 did not have a material effect on the consolidated financial statements of the Company. Effective January 1, 2024, the Company adopted ASU 2023-07, Segment Reporting (Topic 280): “Improvements to Reportable Segment Disclosures” (“ASU 2023-07”) to update reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and information used to assess segment performance. The adoption of ASU 2023-07 did not have a significant impact on the Company’s consolidated financial statements. See Note 16 – Segment Information. Recently Issued Accounting Pronouncements In October 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-06, “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative” (“ASU 2023-06”). This ASU incorporates certain SEC disclosure requirements into the FASB Accounting Standards Codification (“ASC”). The amendments in the ASU are expected to clarify or improve disclosure and presentation requirements of a variety of ASC Topics, allow users to more easily compare entities subject to the SEC’s existing disclosures with those entities that were not previously subject to the requirements, and align the requirements in the ASC with the SEC’s regulations. The ASU has an unusual effective date and transition requirements since it is contingent on future SEC rule setting. If the SEC fails to enact required changes by June 30, 2027, this ASU is not effective for any entities. Early adoption is not permitted. The Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements and disclosures. In December 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures” (“ASU 2023-09”) to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. This ASU applies to all entities subject to income taxes. This ASU will be effective for public companies for annual periods beginning after December 15, 2024 (year ended December 31, 2025 for the Company). The adoption of this standard is not expected to a material impact on the Company’s consolidated financial statements and disclosures. In November 2024, the FASB issued ASU 2024-03, “Income Statement: Reporting Comprehensive Income— Expense Disaggregation Disclosures,” which requires more detailed information about specified categories of expenses (purchases of inventory, employee compensation, depreciation, amortization, and depletion) included in certain expense captions presented on the face of the income statement, as well as disclosures about selling expenses. This ASU is effective for fiscal years beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating this guidance to determine the impact it may have on its consolidated financial statements disclosures. Management does not believe that any other recently issued, but not yet effective, accounting standard, if currently adopted, would have a material effect on the accompanying consolidated financial statements.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2025

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements include the accounts of BIO-key and include all normal and recurring adjustments which are necessary for a fair presentation in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim consolidated financial statements and Rule 8-03 of Regulation S-X promulgated by the Securities and Exchange Commission (the “SEC”). The operating results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the full year ended December 31, 2025. Pursuant to such rules and regulations, certain financial information and footnote disclosures normally included in the financial statements have been condensed or omitted. Intercompany accounts and transactions have been eliminated in consolidation.

In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all necessary adjustments, consisting only of those of a recurring nature, and disclosures to present fairly the Company’s financial position and the results of its operations and cash flows for the periods presented. These unaudited interim condensed consolidated financial statements should be read in conjunction with the financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on April 23, 2025, from which the accompanying condensed consolidated balance sheet dated December 31, 2024 was derived.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currencies

The Company accounts for foreign currency transactions pursuant to Accounting Standards Codification ("ASC") 830, Foreign Currency Matters (“ASC 830”). The functional currency of the Company is the U.S. dollar, which is the currency of the primary economic environment in which it operates. In accordance with ASC 830, all assets and liabilities are translated into U. S. dollars using the current exchange rate at the end of each fiscal period. Revenues and expenses are translated using the average exchange rates prevailing throughout the respective periods. All transaction gains and losses from the measurement of monetary balance sheet items denominated in Euros are reflected in the statement of operations as appropriate. Translation adjustments are included in accumulated other comprehensive income (loss).

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Pronouncements

Effective January 1, 2024, the Company adopted ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06”) to simplify accounting for certain financial instruments. ASU 2020-06 eliminates the current models that require separation of beneficial conversion and cash conversion features from convertible instruments and simplifies the derivative scope exception guidance pertaining to equity classification of contracts in an entity’s own equity. The new standard also introduces additional disclosures for convertible debt and freestanding instruments that are indexed to and settled in an entity’s own equity. ASU 2020-06 amends the diluted earnings per share guidance, including the requirement to use the if-converted method for all convertible instruments. The adoption of ASU 2020-06 did not have a material effect on the consolidated financial statements of the Company.

Effective January 1, 2024, the Company adopted ASU 2023-07, Segment Reporting (Topic 280): “Improvements to Reportable Segment Disclosures” (“ASU 2023-07”) to update reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and information used to assess segment performance. The adoption of ASU 2023-07 did not have a significant impact on the Company’s consolidated financial statements. See Note 16 – Segment Information.

Recently Issued Accounting Pronouncements

In October 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-06, “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative” (“ASU 2023-06”). This ASU incorporates certain SEC disclosure requirements into the FASB Accounting Standards Codification (“ASC”). The amendments in the ASU are expected to clarify or improve disclosure and presentation requirements of a variety of ASC Topics, allow users to more easily compare entities subject to the SEC’s existing disclosures with those entities that were not previously subject to the requirements, and align the requirements in the ASC with the SEC’s regulations. The ASU has an unusual effective date and transition requirements since it is contingent on future SEC rule setting. If the SEC fails to enact required changes by June 30, 2027, this ASU is not effective for any entities. Early adoption is not permitted. The Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements and disclosures.

In December 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures” (“ASU 2023-09”) to enhance the transparency and decision-usefulness of income tax disclosures, particularly in the rate reconciliation table and disclosures about income taxes paid. This ASU applies to all entities subject to income taxes. This ASU will be effective for public companies for annual periods beginning after December 15, 2024 (year ended December 31, 2025 for the Company). The adoption of this standard is not expected to a material impact on the Company’s consolidated financial statements and disclosures.

In November 2024, the FASB issued ASU 2024-03, “Income Statement: Reporting Comprehensive Income— Expense Disaggregation Disclosures,” which requires more detailed information about specified categories of expenses (purchases of inventory, employee compensation, depreciation, amortization, and depletion) included in certain expense captions presented on the face of the income statement, as well as disclosures about selling expenses. This ASU is effective for fiscal years beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating this guidance to determine the impact it may have on its consolidated financial statements disclosures.

Management does not believe that any other recently issued, but not yet effective, accounting standard, if currently adopted, would have a material effect on the accompanying consolidated financial statements.