Note 14 - Segments - Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 534,792	$ 639,813	$ 654,233
Cost of sales	332,434	423,964	470,780
Gross profit	$ 202,358	$ 215,849	$ 183,453
Gross profit %	37.80%	33.70%	28.00%
Research and development costs	$ 23,586	$ 22,487	$ 20,238
Selling, general and administrative expenses	110,616	99,091	92,342
Impairment of CUI tradename	400	0	0
Restructuring charges	3,459	10,114	7,322
Interest expense	4,078	2,850	3,379
Interest income	(4,754)	(1,697)	(177)
Other income/expense, net	3,165	4,503	2,886
Earnings before provision for income taxes	61,808	83,300	59,059
Total Assets	949,789	571,631	560,466
Capital Expenditures	14,108	12,126	8,832
Depreciation and amortization	16,457	13,312	14,863
Gain on sale of properties	0	(3,819)	(1,596)
Gain on sale of Czech Republic business	0	(980)	0
Power Solutions and Protection Segment [Member]
Net sales	245,551	314,105	288,366
Cost of sales	141,425	194,364	200,526
Gross profit	$ 104,126	$ 119,741	$ 87,840
Gross profit %	42.40%	38.10%	30.50%
Interest expense	$ 1,327	$ 0	$ 0
Total Assets	654,131	222,068	234,095
Capital Expenditures	5,446	4,563	3,916
Depreciation and amortization	8,284	5,280	6,470
Connectivity Solutions [Member]
Net sales	220,370	210,572	187,085
Cost of sales	138,606	138,541	138,597
Gross profit	$ 81,764	$ 72,031	$ 48,488
Gross profit %	37.10%	34.20%	25.90%
Interest expense	$ 68	$ 0	$ 0
Total Assets	177,443	197,045	170,895
Capital Expenditures	7,908	7,384	4,566
Depreciation and amortization	6,853	6,152	6,145
Magnetic Solutions Segment [Member]
Net sales	68,871	115,136	178,782
Cost of sales	51,418	89,822	129,492
Gross profit	$ 17,453	$ 25,314	$ 49,290
Gross profit %	25.30%	22.00%	27.60%
Interest expense	$ 0	$ 0	$ 0
Total Assets	51,415	47,900	107,891
Capital Expenditures	281	160	350
Depreciation and amortization	819	1,094	2,133
Corporate Segment [Member]
Net sales	0	0
Cost of sales	985	1,237	2,165
Gross profit	(985)	(1,237)	(2,165)
Interest expense	2,683	2,850	3,379
Total Assets	66,800	104,618	47,585
Capital Expenditures	473	19	0
Depreciation and amortization	$ 501	$ 786	$ 115