Note 10 - License Agreements (Details Textual)	1 Months Ended	12 Months Ended
	Jun. 30, 2023	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Number Of License Agreements		3
Number Of Expired License Agreements	1
Revenue from Contract with Customer, Excluding Assessed Tax		$ 9,070,000	$ 7,177,000
License [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		218,000	372,000
License [Member] | License, Excluding Sell-off Agreements [Member
Revenue from Contract with Customer, Excluding Assessed Tax		218,000	372,000
License [Member] | Sell-off Agreements With Customers [Member]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 175,000	$ 730,000