Note 1 - Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Raw Materials	$ 15,798	$ 15,245
Work in Process	588	479
Finished Goods	556	41
Reserves	(1,579)	(1,486)
Total	$ 15,363	$ 14,279	[1]

[1] The balance sheet at December 31, 2019 has been derived from the audited financial statements at that date