Note 4 - Asset Acquisition (Details Textual) - Lowell Therapeutics [Member] $ in Millions	Jan. 07, 2022 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 8.8
Contingent Consideration Payable Upon Achievement of Milestones [Member]
Business Combination, Contingent Consideration, Liability	$ 26.0

Amount of liability recognized arising from contingent consideration in a business combination.

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