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Note 11 - Leases (Details Textual)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 01, 2023
Dec. 22, 2020
ft²
Lessee, Operating Lease, Term of Contract (Year)         1 year  
Lessee, Operating Lease, Discount Rate 8.50%   8.50%      
Leases Under 12 Months [Member]            
Operating Lease, Expense $ 0.1 $ 0.1 $ 0.7 $ 0.2    
Leases Over 12 Months [Member]            
Operating Lease, Expense $ 0.2 $ 0.2 $ 0.7 $ 0.2    
Addison, Illinois Manufacturing Facility [Member]            
Area of Real Estate Property (Square Foot) | ft²           55,120