Note 12 - Segment and Enterprise-wide Disclosures - Net Sales to Unaffiliated Customers by Geography (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 48,883	$ 47,411	$ 50,115	$ 47,075	$ 40,954	$ 39,028	$ 42,108	$ 39,561	$ 193,484	$ 161,651	$ 154,424
Net sales	$ 48,883	$ 47,411	$ 50,115	$ 47,075	$ 40,954	$ 39,028	$ 42,108	$ 39,561	193,484	161,651	154,424
UNITED STATES
Net sales									117,811	99,463	93,866
Net sales									117,811	99,463	93,866
GERMANY
Net sales									13,420	11,223	12,968
Net sales									13,420	11,223	12,968
CANADA
Net sales									10,786	8,336	7,054
Net sales									10,786	8,336	7,054
UNITED KINGDOM
Net sales									8,561	5,841	5,046
Net sales									8,561	5,841	5,046
Other Countries [Member]
Net sales									42,906	36,788	35,490
Net sales									$ 42,906	$ 36,788	$ 35,490