Note 1 - Summary of Significant Accounting Policies - Segment Reporting (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Sales, net		$ 76,592	$ 74,094
Cost of products		47,542	51,858
Engineering and product development		7,841	9,334
Selling, general and administrative expenses		21,222	23,013
Operating income (loss)		7,828	(777)
Income tax (expense) benefit		(984)	54
Net income (loss)		8,359	(2,230)
Loss on investments		(91)	(740)
Operating Segments [Member]
Sales, net		76,592	74,094
Cost of products		47,542	51,858
Gross margin		29,050	22,236
Engineering and product development		7,841	9,334
Marketing and selling		6,206	6,058
General and administrative		7,175	7,621
Selling, general and administrative expenses		21,222	23,013
Operating income (loss)		7,828	(777)
Other (expense) income (a)	[1]	(362)	(659)
Income tax (expense) benefit		984	(54)
Net income (loss)		8,450	(1,490)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Loss on investments		$ (91)	$ (740)

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