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Note 3 - Revenue - Disaggregation of Revenue by Product Group and Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 103,978	$ 125,389
Sales Channel, Directly to Consumer [Member]
Revenue	70,972	91,222
Sales Channel, Through Intermediary [Member]
Revenue	33,006	34,167
North America [Member]
Revenue	59,533	64,587
Europe [Member]
Revenue	18,277	23,525
Asia [Member]
Revenue	26,168	37,277
Connectivity Solutions [Member]
Revenue	39,100	44,361
Connectivity Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	25,053	29,615
Connectivity Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	14,047	14,746
Connectivity Solutions [Member] | North America [Member]
Revenue	29,703	32,121
Connectivity Solutions [Member] | Europe [Member]
Revenue	7,762	8,765
Connectivity Solutions [Member] | Asia [Member]
Revenue	1,635	3,475
Power Solutions and Protection [Member]
Revenue	36,177	42,772
Power Solutions and Protection [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	21,577	29,101
Power Solutions and Protection [Member] | Sales Channel, Through Intermediary [Member]
Revenue	14,600	13,671
Power Solutions and Protection [Member] | North America [Member]
Revenue	22,723	23,521
Power Solutions and Protection [Member] | Europe [Member]
Revenue	9,314	12,539
Power Solutions and Protection [Member] | Asia [Member]
Revenue	4,140	6,712
Magnetic Solutions [Member]
Revenue	28,701	38,256
Magnetic Solutions [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	24,342	32,506
Magnetic Solutions [Member] | Sales Channel, Through Intermediary [Member]
Revenue	4,359	5,750
Magnetic Solutions [Member] | North America [Member]
Revenue	7,107	8,945
Magnetic Solutions [Member] | Europe [Member]
Revenue	1,201	2,221
Magnetic Solutions [Member] | Asia [Member]
Revenue	$ 20,393	$ 27,090

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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