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Note 8 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 559,515	$ 455,839	$ 1,452,098	$ 1,181,199
Domestic [Member]
Net sales	453,259	362,909	1,134,525	915,483
International [Member]
Net sales	106,256	92,930	317,573	265,716
Residential Power Products [Member]
Net sales	311,918	251,203	748,790	603,888
Residential Power Products [Member] | Domestic [Member]
Net sales	300,387	236,821	711,203	563,636
Residential Power Products [Member] | International [Member]
Net sales	11,531	14,382	37,587	40,252
Commercial and Industrial Power Products [Member]
Net sales	206,366	173,842	597,119	494,498
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales	121,952	101,122	340,244	284,796
Commercial and Industrial Power Products [Member] | International [Member]
Net sales	84,414	72,720	256,875	209,702
Other Products and Services [Member]
Net sales	41,231	30,794	106,189	82,813
Other Products and Services [Member] | Domestic [Member]
Net sales	30,920	24,966	83,078	67,051
Other Products and Services [Member] | International [Member]
Net sales	$ 10,311	$ 5,828	$ 23,111	$ 15,762

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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