Avenue Therapeutics, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Note 4 - Related Party Agreements (Details Textual)

Note 4 - Related Party Agreements (Details Textual) - USD ($)							1 Months Ended	12 Months Ended
	Nov. 05, 2025	Nov. 13, 2024	Mar. 09, 2017	Sep. 30, 2016	Sep. 13, 2016	Feb. 17, 2015	Feb. 28, 2015	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2022	Nov. 08, 2022
Stock Issued During Period, Shares, New Issues (in shares)				250,000
Forgiveness of Subsidiary Debt								$ (37,000)
Subscription and Forgiveness Agreement with Fortress [Member]
Debt Instrument, Forgiveness, Percent Converted to Stock		50.00%
Debt Instrument, Forgiveness, Amount Converted to Stock		$ 500,000
Debt Instrument, Forgiveness, Percent Forgiven		50.00%
Stock Issued During Period, Shares, New Issues (in shares)		122,850
Shares Issued, Price Per Share (in dollars per share)		$ 2.035
Debt Instrument, Decrease, Forgiveness		$ 500,000
Fortress [Member]
Notes Assumed							$ 3,000,000
Percentage of Fully-diluted Outstanding Equity							2.50%
Percentage of Equity or Debt Fnancing							2.50%
Percentage of Annual net Sales							4.50%
Amended Founders Agreements Terms (Year)					15 years
Number Of Shares Exchanged (in shares)					166,027
Fortress [Member] \| Management Services Agreement [Member]
Term of Agreement (Year)						5 years
Automatic Renewal Term of Agreement (Year)						5 years
Annual Consulting Fee						$ 500,000
Increase in Annual Consulting Fee						1,000,000
Excess in Net Assets Value						$ 100,000,000
Costs and Expenses, Related Party								500,000	$ 250,000
Fortress [Member] \| Management Services Agreement [Member] \| Research and Development Expense [Member]
Costs and Expenses, Related Party								250,000	125,000
Fortress [Member] \| Management Services Agreement [Member] \| General and Administrative Expense [Member]
Costs and Expenses, Related Party								250,000	125,000
Fortress [Member] \| Avenue Baergic Founders Agreement [Member]
Excess in Net Assets Value			$ 100,000,000
Forgiveness of Subsidiary Debt	$ 2,900,000
Fortress [Member] \| Common Class A [Member]
Number Of Shares Exchanged (in shares)					155,555
Fortress [Member] \| Preferred Class A [Member]
Number Of Shares Exchanged (in shares)					250,000
BaergicBio, Inc.[Member]
Proceeds From Equity Fee								$ 0	$ 18,000
Forgiveness of Subsidiary Debt	$ 600,000
BaergicBio, Inc.[Member] \| Founders Agreement and Management Services Agreement [Member]
Percentage of Equity Fee											2.50%
BaergicBio, Inc.[Member] \| Avenue Baergic Founders Agreement [Member]
Term of Agreement (Year)			5 years
Annual Consulting Fee			$ 500,000
Increase in Annual Consulting Fee			$ 1,000,000
Percentage Of Additional Consideration Of Equity Fee										2.50%
Percentage Considered For The Calculation Of One-Time Fee										4.50%