Note 2 - Warrant Liability and Fair Value of Financial Instruments (Details Textual) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended
		Jul. 07, 2023 USD ($) $ / shares		Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Mar. 31, 2024 USD ($)	Jan. 29, 2024 $ / shares
Gain (Loss) on Derivative Instruments, Net, Pretax				$ (0)	$ (4,556)	$ (0)	$ (4,556)
Fair Value Adjustment of Warrants				(0)	$ 239	(0)	$ 239
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares					$ 0.02		$ 0.02
The Warrant [Member] | Termination Agreement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.02							$ 0.02
Class of Warrant or Right, Value of Securities Called by Warrants or Rights		$ 8,000
Measurement Input, Discount Rate [Member] | Fair Value, Recurring [Member]
Warrants and Rights Outstanding, Measurement Input	[1]	20
Measurement Input, Discount Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Fair Value, Recurring [Member]
Warrants and Rights Outstanding, Measurement Input					0.2135		0.2135
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Qualified Offering Occurring, One [Member]
Warrants and Rights Outstanding, Measurement Input					0.70		0.70
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Qualified Offering Occurring, Two [Member]
Warrants and Rights Outstanding, Measurement Input		0.10	[2]		0.10		0.10
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | No Qualified Offering Occurring [Member]
Warrants and Rights Outstanding, Measurement Input					0.20		0.20
Measurement Input, Expected Term [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Fair Value, Recurring [Member] | Minimum [Member]
Warrants and Rights Outstanding, Measurement Input		0.48	[3]		0.25		0.25
Measurement Input, Expected Term [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Fair Value, Recurring [Member] | Maximum [Member]
Warrants and Rights Outstanding, Measurement Input		0.98	[3]		0.75		0.75
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure				0		0		$ 0
Liabilities, Fair Value Disclosure				$ 0		$ 0		$ 0

[1] The initial discount rate was chosen based on private equity rates of return as described in the AICPA Practice Aid on Valuation of Privately-Held-Company Equity securities issued as compensation. For the recurring fair value measurement, the Company updated the discount rate based upon yield curves estimated to be similar in credit quality to the Company. The updated discount rate as of September 30, 2023 was 21.35%%;

[2] Scenario probability as of issuance and September 30, 2023 was based on timing expectations of management that a qualified offering occurring as of December 31, 2023 was estimated at 70%; a qualified offering occurring as of June 30, 2024 was estimated at 10%; and no qualified offering occurring was estimated at 20%;

[3] For the subsequent recurring fair value measurements as of September 30, 2023, the Company updated the expected term to a range between 0.25 - 0.75 years.