Note 9 - Segment and Enterprise-wide Disclosures - Net Sales to Unaffiliated Customers by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Sales	$ 40,670	$ 24,851	$ 76,553	$ 55,402
UNITED STATES
Net Sales	25,172	13,535	47,140	30,535
GERMANY
Net Sales	3,154	2,699	6,217	5,993
Other Countries [Member]
Net Sales	$ 12,344	$ 8,617	$ 23,196	$ 18,874