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Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 541,916	$ 497,581	$ 1,012,269	$ 897,672
Residential Power Products [Member]
Net sales	268,374	246,398	486,204	436,872
Commercial and Industrial Power Products [Member]
Net sales	230,428	215,628	439,552	390,753
Other Products and Services [Member]
Net sales	43,114	35,555	86,513	70,047
Domestic [Member]
Net sales	425,938	383,679	785,186	686,355
Domestic [Member] | Residential Power Products [Member]
Net sales	255,182	234,131	460,363	410,816
Domestic [Member] | Commercial and Industrial Power Products [Member]
Net sales	138,540	120,521	260,986	218,292
Domestic [Member] | Other Products and Services [Member]
Net sales	32,216	29,027	63,837	57,247
International [Member]
Net sales	115,978	113,902	227,083	211,317
International [Member] | Residential Power Products [Member]
Net sales	13,192	12,267	25,841	26,056
International [Member] | Commercial and Industrial Power Products [Member]
Net sales	91,889	95,107	178,566	172,461
International [Member] | Other Products and Services [Member]
Net sales	$ 10,897	$ 6,528	$ 22,675	$ 12,800

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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