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Note 2 - Significant Accounting Policies (Details Textual) $ / shares in Units, shares in Thousands			3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Jul. 16, 2024 USD ($)	Jul. 15, 2024 USD ($)	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) shares	Jun. 20, 2025 USD ($)	May 07, 2024 $ / shares	Jan. 03, 2024 $ / shares	Jan. 02, 2024 shares
Class of Warrant or Right, Fair Value of Common Stock Warrants per Warrant (in dollars per share) | $ / shares											$ 6.71
Class of Warrant or Right, Redemption Price per Share (in dollars per share) | $ / shares										$ 0.001
Number of Operating Segments						1
Number of Reportable Segments						1
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation						$ (22,504,000)	$ (55,664,000)
Class of Warrant or Right, Outstanding (in shares) | shares			0			0		0				16,895
Proceeds from Insurance Settlement, Operating Activities			$ 0	$ 1,100,000	$ 0		9,900,000
Former Senior Vice President [Member]
Consulting Agreement, Term	1
Consulting Service, Price Per Hour	$ 500
Related Party Transaction, Amounts of Transaction			0	$ 29,000		$ 20,000	29,000
Former Chief Medical Officer [Member]
Consulting Agreement, Term									1
Related Party Transaction, Amounts of Transaction			21,000			42,000
Consulting Agreement, Fixed Fee									$ 42,000
Former President and Chief Executive Officer [Member]
Severance Costs		$ 1,230,000	0			0	1,230,000
Former Senior Vice President [Member]
Severance Costs	$ 500,000		$ 0			0	$ 500,000
Former Senior Officer [Member]
Severance Costs						$ 0		$ 1,200,000
Number of Former Employees							2
Building [Member]
Property, Plant and Equipment, Useful Life (Year)			39 years			39 years
Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)			10 years			10 years
Share-Based Payment Arrangement, Option [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						1 year
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						4 years

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