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 |