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Disclosure - Note 11 - Stock Options and Stock-based Employee Compensation - Stock Options Valuation Assumptions (Details) Sheet http://www.windtreetx.com/20211231/role/statement-note-11-stock-options-and-stockbased-employee-compensation-stock-options-valuation-assumptions-details Note 11 - Stock Options and Stock-based Employee Compensation - Stock Options Valuation Assumptions (Details) Details 51 false false R52.htm 051 - Disclosure - Note 12 - Collaboration, Licensing and Research Funding Agreements (Details Textual) Sheet http://www.windtreetx.com/20211231/role/statement-note-12-collaboration-licensing-and-research-funding-agreements-details-textual Note 12 - Collaboration, Licensing and Research Funding Agreements (Details Textual) Details http://www.windtreetx.com/20211231/role/statement-note-12-collaboration-licensing-and-research-funding-agreements 52 false false R53.htm 052 - Disclosure - Note 13 - Related Party Transactions (Details Textual) Sheet http://www.windtreetx.com/20211231/role/statement-note-13-related-party-transactions-details-textual Note 13 - 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