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Note 6 - Inventories - Inventories (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Raw materials $ 4,620,000 $ 4,567,000
Work in process 1,239,000 1,058,000
Finished goods 4,776,000 4,624,000
$ 10,635,000 $ 10,249,000 [1]
[1] The condensed consolidated balance sheet as of December 31, 2017 has been prepared using information from the audited consolidated balance sheet as of that date.