Note 7 - Equity Transactions (Details Textual) - USD ($)								3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 01, 2023	May 02, 2023	Apr. 20, 2023	Apr. 03, 2023	Feb. 27, 2023	Jan. 25, 2023	Jan. 03, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021	Mar. 03, 2023	Dec. 31, 2022	Jun. 24, 2021
Common Stock, Shares Authorized								50,000,000		50,000,000			50,000,000	20,000,000	20,000,000
Stock Issued During Period, Value, Warrants Exercised										$ 168
Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							1,678,696
Class of Warrant or Right, Purchase Price of Warrants or Rights (in dollars per share)							$ 1.61
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.0001
Class of Warrant or Right, Maximum Beneficial Ownership Percent.							9.99%
Stock Issued During Period, Shares, Warrants Exercised (in shares)				537,000	741,000	400,696
Stock Issued During Period, Value, Warrants Exercised				$ 54	$ 74	$ 40
Series A-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,608,696
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 1.36
Warrants and Rights Outstanding, Term (Year)							5 years
Series A-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,608,696
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 1.36
Warrants and Rights Outstanding, Term (Year)							3 years
Class of Warrant or Right, Maximum Beneficial Ownership Percent.							4.99%
Warrants Issued to Placement Agent [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							156,522
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 2.0125
Warrants and Rights Outstanding, Term (Year)							5 years
Warrants Issued in April 20, 2023 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			1,562,883
Class of Warrant or Right, Purchase Price of Warrants or Rights (in dollars per share)			$ 0.835
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.71
Warrants and Rights Outstanding, Term (Year)			7 years
Warrants Issued to Rafael Holdings [Member] | Rafael Holdings, Inc. [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	4,000,000	2,514,970
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.25	$ 0.71
Warrants and Rights Outstanding, Term (Year)	7 years	7 years
Warrants To Purchase Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								13,733,117		13,733,117
Warrants To Purchase Common Stock [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.71		$ 0.71
Warrants To Purchase Common Stock [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 65.00		$ 65.00
Warrants to Purchase Units Sold in May 2016 Private Placement [Member]
Warrants and Rights Outstanding, Term (Year)								7 years		7 years
Warrants to Purchase Units Sold in February 2017 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								1,641		1,641
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 35.00		$ 35.00
Warrants to Purchase Units Sold in October 2017 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								2,400		2,400
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 25.00		$ 25.00
Warrants to Purchase Units Sold in May 2016, February 2017 and October 2017 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								8,082		8,082
Warrants and Rights Outstanding								$ 234,861		$ 234,861
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)							930,000
Shares Issued, Price Per Share (in dollars per share)							$ 1.61
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs							$ 3,700,000
Stock Issued, Offering Fee, Percentage of Proceeds							7.50%
Stock Issued, Management Fee, Percentage of Proceeds							1.00%
Non-accountable Expense							$ 35,000
Legal Counsel Expense and Other Out-of-pocket Expense							50,000
Clearing Expense							$ 15,950
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			1,562,883
Proceeds from Issuance or Sale of Equity			$ 1,305,000
Private Placement [Member] | Rafael Holdings, Inc. [Member]
Stock Issued During Period, Shares, New Issues (in shares)	4,000,000	2,514,970
Proceeds from Issuance or Sale of Equity	$ 5,000,000	$ 2,100,000
Board Members [Member]
Share-Based Payment Arrangement, Expense								$ 75,460		$ 185,635	$ 10,500
Deferred Compensation Liability, Current and Noncurrent														$ 30,750
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)								55,485	16,017		39,083	11,327
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture									$ 30,752		$ 102,512	$ 41,004
Employees [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)								0			7,500
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture											$ 15,750
Scientific Advisory Board [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)											5,000
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture											$ 10,500