Note 1 - Condensed Consolidated Financial Statements - Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Sales, net		$ 24,411			$ 20,179			$ 64,630	$ 58,664
Cost of products		12,222			12,343			33,453	36,993
Gross margin		12,189			7,836			31,177	21,671
Engineering and product development		2,771			1,861			7,805	5,922
General and administrative		2,443			1,905			5,704	5,513
Selling, general and administrative expenses		7,344			5,225			19,419	16,052
Operating income		4,845			2,611			11,758	5,619
Net income (loss)		3,436	$ 3,741	$ 2,132	2,357	$ 1,664	$ 681	9,309	4,702
Loss on investments								(0)	(91)
Income tax expense		(1,452)			(247)			(2,397)	(488)
Operating Segments [Member]
Sales, net		24,411			20,179			64,630	58,664
Cost of products		12,222			12,343			33,453	36,993
Gross margin		12,189			7,836			31,177	21,671
Engineering and product development		2,771			1,861			7,805	5,922
Marketing and selling		2,130			1,459			5,910	4,617
General and administrative		2,443			1,905			5,704	5,513
Selling, general and administrative expenses		7,344			5,225			19,419	16,052
Operating income		4,845			2,611			11,758	5,619
Other income (expense) (a)	[1]	43			(7)			(52)	(338)
Net income (loss)		4,888			2,604			11,706	5,281
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Loss on investments		$ 0			$ 0			$ 0	$ (91)

[1] Other segment items include interest income (expense) and foreign currency exchange gains/losses.