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Note 6 - Inventories - Inventories (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Raw materials $ 6,711,000 $ 4,284,000
Work in process 2,626,000 2,559,000
Finished goods 2,643,000 4,460,000
Inventory, Net, Total $ 11,980,000 $ 11,303,000 [1]
[1] The condensed consolidated balance sheet as of December 31, 2019 has been prepared using information from the audited consolidated balance sheet as of that date.