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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
Nov. 02, 2022
Jul. 27, 2022
Mar. 31, 2026
Purchase Obligation     $ 19.3
Himmelberg V. Vaxart, Inc. et al. [Member]      
Litigation Settlement, Amount Awarded to Other Party   $ 12.0  
Payments for Legal Settlements $ 2.0    
Reimbursable Purchase Agreement Commitment to Vendor [Member]      
Purchase Obligation     18.2
Cost-plus-fixed-fees Arrangement Under ATI-RRPV Contract [Member]      
Purchase Obligation     $ 19.6