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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 21 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Amortization Expense of Intangible Assets $ 1.2 $ 1.6 $ 3.7 $ 4.9  
Tris Karbinal Agreement [Member]          
Supply and Distribution Agreement, Extension Term (Year)         20 years
Minimum [Member]          
Finite-Lived Intangible Asset, Useful Life, Renewable Period (Year)     1 year    
Maximum [Member]          
Finite-Lived Intangible Asset, Useful Life, Renewable Period (Year)     20 years