Note 3 - Revenue Recognition - Revenue Disaggregated by the Major Types of Goods and Services Sold (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Net sales	$ 56,343	$ 50,723	$ 50,655	$ 48,599	$ 45,153	$ 43,299	$ 42,644	$ 48,277	$ 206,320	$ 179,373	[1]	$ 198,381
Product [Member]
Net sales									201,248	172,299		193,016
Tooling and Machinery [Member]
Net sales									1,814	2,787		2,730
Engineering and Development [Member]
Net sales									$ 3,258	$ 4,287		$ 2,635

[1] Certain amounts for the three and nine months ended September 30, 2021 were reclassified between markets to conform to the current period presentation.