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Note 2 - Significant Accounting Policies (Details Textual)			3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Jul. 16, 2024 USD ($)	Jul. 15, 2024 USD ($)	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025	Jun. 30, 2024 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2024 shares	Dec. 31, 2024 USD ($) shares	Jun. 20, 2025 USD ($)	May 07, 2024 $ / shares	Mar. 31, 2024 shares	Jan. 03, 2024 $ / shares 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
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation						$ (16,283,000)	$ (37,368,000)
Class of Warrant or Right, Outstanding (in shares) | shares			0			0			0					16,895,000
Proceeds from Insurance Settlement, Operating Activities			$ 0		$ 5,800,000	$ 0	8,800,000
Former Senior Vice President [Member]
Consulting Agreement, Term	1
Consulting Service, Price Per Hour	$ 500
Related Party Transaction, Amounts of Transaction			20,000		0	20,000	0
Former Chief Medical Officer [Member]
Consulting Agreement, Term										1
Related Party Transaction, Amounts of Transaction			21,000			21,000
Consulting Agreement, Fixed Fee										$ 42,000
Former President and Chief Executive Officer [Member]
Severance Costs		$ 1,230,000	0		0	0	0
Former Senior Vice President [Member]
Severance Costs	$ 500,000		$ 0		$ 0	0	$ 0
Former Senior Officer [Member]
Severance Costs						$ 300,000			$ 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
Warrants to Purchase Common Stock [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares					1.5		1.5						1.5
Class of Warrant or Right, Outstanding (in shares) | shares					0		0	0	0			16,221,000
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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