Note 1 - Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Raw Materials	$ 17,235	$ 14,865
Work in Process	1,143	969
Finished Goods	465	242
Reserves	(1,764)	(2,159)
Total	$ 17,079	$ 13,917	[1]

[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date