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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finished goods $ 11,841 $ 10,749
Raw materials 6,996 8,098
Total inventories 18,837 18,847
Current portion 11,181 10,034
Long-term portion $ 7,656 $ 8,813