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Note 4 - Inventory - Noncurrent Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Total inventory, non-current $ 2,237 $ 2,396
Enriched Barium Inventory [Member]    
Total inventory, non-current 1,905 2,121
Raw Materials [Member]    
Total inventory, non-current $ 332 $ 275