Note 1 - Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Raw Materials	$ 16,447	$ 16,769
Work in Process	780	1,015
Finished Goods	212	332
Reserves	(1,166)	(1,112)
Total	$ 16,273	$ 17,004	[1]

[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.