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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 546,848	$ 541,916	$ 1,022,763	$ 1,012,269
Domestic [Member]
Net sales	460,774	421,532	836,804	778,030
International [Member]
Net sales	86,074	120,384	185,959	234,239
Residential Power Products [Member]
Net sales	341,352	268,374	598,971	486,204
Residential Power Products [Member] | Domestic [Member]
Net sales	327,857	252,340	571,686	456,599
Residential Power Products [Member] | International [Member]
Net sales	13,495	16,034	27,285	29,605
Commercial and Industrial Power Products [Member]
Net sales	154,890	230,428	326,957	439,552
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales	90,339	137,197	186,167	258,022
Commercial and Industrial Power Products [Member] | International [Member]
Net sales	64,551	93,231	140,790	181,530
Other Products and Services [Member]
Net sales	50,606	43,114	96,835	86,513
Other Products and Services [Member] | Domestic [Member]
Net sales	42,578	31,995	78,951	63,409
Other Products and Services [Member] | International [Member]
Net sales	$ 8,028	$ 11,119	$ 17,884	$ 23,104

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.

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