Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2021
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 International, Inc. and its wholly-owned subsidiaries (collectively, the “Company” or “BIO-key”) and are stated in conformity with accounting principles generally accepted in the United States of America, pursuant to the rules and regulations of 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. 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. The balance sheet at December 31, 2020 was derived from the audited financial statements, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. 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, 2020, filed with the SEC on March 29, 2021. Effective November 20, 2020, the Company implemented a reverse stock split of its outstanding common stock at a ratio of 1-for-8. All share figures and results are reflected on a post-split basis.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency The Company accounts for foreign currency transactions pursuant to 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, monetary balances denominated in or linked to foreign currency are stated on the basis of the exchange rates prevailing at the applicable balance sheet date. For foreign currency transactions included in the statement of operations, the exchange rates applicable on the relevant transaction dates are used. Gains or losses arising from changes in the exchange rates used in the translation of such transactions and from the remeasurement of the monetary balance sheet items are recorded as gain (loss) on foreign currency transactions.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), referred to herein as ASU 2016-13, which significantly changes how entities will account for credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 replaces the existing incurred loss model with an expected credit loss model that requires entities to estimate an expected lifetime credit loss on most financial assets and certain other instruments. Under ASU 2016-13 credit impairment is recognized as an allowance for credit losses, rather than as a direct write-down of the amortized cost basis of a financial asset. The impairment allowance is a valuation account deducted from the amortized cost basis of financial assets to present the net amount expected to be collected on the financial asset. Once the new pronouncement is adopted by the Company, the allowance for credit losses must be adjusted for management’s current estimate at each reporting date. The new guidance provides no threshold for recognition of impairment allowance. Therefore, entities must also measure expected credit losses on assets that have a low risk of loss. For instance, trade receivables that are either current or not yet due may not require an allowance reserve under currently generally accepted accounting principles, but under the new standard, the Company will have to estimate an allowance for expected credit losses on trade receivables under ASU 2016-13. ASU 2016-13 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2022 for smaller reporting companies (quarter ending March 31, 2023 for the Company). Early adoption is permitted. The Company will evaluate the impact ASU 2016-13 will have on its consolidated financial statements in a future period closer to the date of adoption. Effective January 1, 2021, the Company adopted ASU 2019-12, Simplifying the Accounting for Income Taxes (“ASU 2019-12”) to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities for outside basis differences. ASU 2019-12 also amends other aspects of the guidance to help simplify and promote consistent application of U.S. GAAP. Most amendments within ASU 2019-12 are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. The adoption of ASU 2019-12 did not have a significant impact on the Company’s consolidated financial statements. 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.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassification Reclassifications occurred to certain prior year amounts in order to conform to the current year classifications. The reclassifications have no effect on the reported net loss.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements include the accounts of BIO-key International, Inc. and its wholly-owned subsidiaries (collectively, the “Company” or “BIO-key”) and are stated in conformity with accounting principles generally accepted in the United States of America, pursuant to the rules and regulations of 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. 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. The balance sheet at December 31, 2020 was derived from the audited financial statements, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America. 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, 2020, filed with the SEC on March 29, 2021.

Effective November 20, 2020, the Company implemented a reverse stock split of its outstanding common stock at a ratio of 1-for-8. All share figures and results are reflected on a post-split basis.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency

The Company accounts for foreign currency transactions pursuant to 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, monetary balances denominated in or linked to foreign currency are stated on the basis of the exchange rates prevailing at the applicable balance sheet date. For foreign currency transactions included in the statement of operations, the exchange rates applicable on the relevant transaction dates are used. Gains or losses arising from changes in the exchange rates used in the translation of such transactions and from the remeasurement of the monetary balance sheet items are recorded as gain (loss) on foreign currency transactions.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), referred to herein as ASU 2016-13, which significantly changes how entities will account for credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 replaces the existing incurred loss model with an expected credit loss model that requires entities to estimate an expected lifetime credit loss on most financial assets and certain other instruments. Under ASU 2016-13 credit impairment is recognized as an allowance for credit losses, rather than as a direct write-down of the amortized cost basis of a financial asset. The impairment allowance is a valuation account deducted from the amortized cost basis of financial assets to present the net amount expected to be collected on the financial asset. Once the new pronouncement is adopted by the Company, the allowance for credit losses must be adjusted for management’s current estimate at each reporting date. The new guidance provides no threshold for recognition of impairment allowance. Therefore, entities must also measure expected credit losses on assets that have a low risk of loss. For instance, trade receivables that are either current or not yet due may not require an allowance reserve under currently generally accepted accounting principles, but under the new standard, the Company will have to estimate an allowance for expected credit losses on trade receivables under ASU 2016-13. ASU 2016-13 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2022 for smaller reporting companies (quarter ending March 31, 2023 for the Company). Early adoption is permitted. The Company will evaluate the impact ASU 2016-13 will have on its consolidated financial statements in a future period closer to the date of adoption.

Effective January 1, 2021, the Company adopted ASU 2019-12, Simplifying the Accounting for Income Taxes (“ASU 2019-12”) to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities for outside basis differences. ASU 2019-12 also amends other aspects of the guidance to help simplify and promote consistent application of U.S. GAAP. Most amendments within ASU 2019-12 are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. The adoption of ASU 2019-12 did not have a significant impact on the Company’s consolidated financial statements.

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.

Reclassification, Comparability Adjustment [Policy Text Block]

Reclassification

Reclassifications occurred to certain prior year amounts in order to conform to the current year classifications. The reclassifications have no effect on the reported net loss.