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Note 6 - Inventories - Inventories (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Raw materials $ 10,866,000 $ 9,729,000
Work in process 2,180,000 2,003,000
Finished goods 5,732,000 5,017,000
Inventory, Net, Total $ 18,778,000 $ 16,749,000 [1]
[1] The condensed consolidated balance sheet as of December 31, 2020 has been prepared using information from the audited consolidated balance sheet as of that date.