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Note 6 - Inventories - Inventories (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Raw materials $ 4,784,000 $ 4,732,000
Work in process 1,144,000 825,000
Finished goods 4,479,000 4,321,000
$ 10,407,000 $ 9,878,000 [1]
[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.