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Note 8 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 494,949	$ 394,875	$ 892,583	$ 725,360
Domestic [Member]
Net sales	381,047	305,406	681,266	552,574
International [Member]
Net sales	113,902	89,469	211,317	172,786
Residential Power Products [Member]
Net sales	246,398	198,468	436,872	352,685
Residential Power Products [Member] | Domestic [Member]
Net sales	234,131	185,114	410,816	326,815
Residential Power Products [Member] | International [Member]
Net sales	12,267	13,354	26,056	25,870
Commercial and Industrial Power Products [Member]
Net sales	215,628	169,903	390,753	320,656
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales	120,521	98,909	218,292	183,674
Commercial and Industrial Power Products [Member] | International [Member]
Net sales	95,107	70,994	172,461	136,982
Other Products and Services [Member]
Net sales	32,923	26,504	64,958	52,019
Other Products and Services [Member] | Domestic [Member]
Net sales	26,395	21,383	52,158	42,085
Other Products and Services [Member] | International [Member]
Net sales	$ 6,528	$ 5,121	$ 12,800	$ 9,934

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

+ Details

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- Details

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