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Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net sales	$ 470,353	$ 400,091
Residential Power Products [Member]
Net sales	217,830	190,474
Commercial and Industrial Power Products [Member]
Net sales	209,124	175,125
Other Products and Services [Member]
Net sales	43,399	34,492
Domestic [Member]
Net sales	359,248	302,676
Domestic [Member] | Residential Power Products [Member]
Net sales	205,181	176,685
Domestic [Member] | Commercial and Industrial Power Products [Member]
Net sales	122,446	97,771
Domestic [Member] | Other Products and Services [Member]
Net sales	31,621	28,220
International [Member]
Net sales	111,105	97,415
International [Member] | Residential Power Products [Member]
Net sales	12,649	13,789
International [Member] | Commercial and Industrial Power Products [Member]
Net sales	86,678	77,354
International [Member] | Other Products and Services [Member]
Net sales	$ 11,778	$ 6,272

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
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

+ Details

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- Details

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X

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