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Note 11 - Leases (Details Textual)
$ in Millions
3 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 22, 2020
ft²
Lessee, Operating Lease, Term of Contract (Year) 1 year    
Lessee, Operating Lease, Discount Rate 8.50%    
Leases Under 12 Months [Member]      
Operating Lease, Expense $ 0.1 $ 0.1  
Leases Over 12 Months [Member]      
Operating Lease, Expense $ 0.1 $ 0.1  
Addison, Illinois Manufacturing Facility [Member]      
Area of Real Estate Property (Square Foot) | ft²     55,120