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Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 601,135	$ 562,388	$ 1,613,404	$ 1,460,060
Residential Power Products [Member]
Net sales	335,029	311,918	821,233	748,790
Commercial and Industrial Power Products [Member]
Net sales	214,905	206,366	654,458	597,119
Other Products and Services [Member]
Net sales	51,201	44,104	137,713	114,151
Domestic [Member]
Net sales	498,163	456,132	1,283,348	1,142,487
Domestic [Member] | Residential Power Products [Member]
Net sales	324,096	300,387	784,459	711,203
Domestic [Member] | Commercial and Industrial Power Products [Member]
Net sales	133,559	121,952	394,545	340,244
Domestic [Member] | Other Products and Services [Member]
Net sales	40,508	33,793	104,344	91,040
International [Member]
Net sales	102,972	106,256	330,056	317,573
International [Member] | Residential Power Products [Member]
Net sales	10,933	11,531	36,774	37,587
International [Member] | Commercial and Industrial Power Products [Member]
Net sales	81,346	84,414	259,913	256,875
International [Member] | Other Products and Services [Member]
Net sales	$ 10,693	$ 10,311	$ 33,369	$ 23,111

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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X

- Details

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X

- Details

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