Note 11 - Segment Information - Consolidated Net Sales by Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net sales	$ 24,917	$ 26,563
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member]
Net sales	$ 24,900	$ 26,600
Concentration Risk, Percentage	100.00%	100.00%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| UNITED STATES
Net sales	$ 4,600	$ 6,500
Concentration Risk, Percentage	18.50%	24.40%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| Americas, Other [Member]
Net sales	$ 2,100	$ 2,500
Concentration Risk, Percentage	8.40%	9.40%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| Americas [Member]
Net sales	$ 6,700	$ 9,000
Concentration Risk, Percentage	26.90%	33.80%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| CHINA
Net sales	$ 2,700	$ 2,000
Concentration Risk, Percentage	10.90%	7.50%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| KOREA, REPUBLIC OF
Net sales	$ 10,200	$ 10,600
Concentration Risk, Percentage	41.00%	39.80%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| Asia Pacific, Other [Member]
Net sales	$ 3,000	$ 2,800
Concentration Risk, Percentage	12.00%	10.50%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| Asia Pacific [Member]
Net sales	$ 15,900	$ 15,400
Concentration Risk, Percentage	63.90%	57.90%
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| EMEA [Member]
Net sales	$ 2,300	$ 2,200
Concentration Risk, Percentage	9.20%	8.30%