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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 919,981	$ 546,848	$ 1,727,415	$ 1,022,763
Domestic [Member]
Net sales	784,146	460,774	1,476,884	836,804
International [Member]
Net sales	135,835	86,074	250,531	185,959
Residential Power Products [Member]
Net sales	599,991	341,352	1,142,140	598,971
Residential Power Products [Member] | Domestic [Member]
Net sales	583,341	327,857	1,105,556	571,686
Residential Power Products [Member] | International [Member]
Net sales	16,650	13,495	36,584	27,285
Commercial and Industrial Power Products [Member]
Net sales	254,295	154,890	456,686	326,957
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales	143,654	90,339	261,533	186,167
Commercial and Industrial Power Products [Member] | International [Member]
Net sales	110,641	64,551	195,153	140,790
Other Products and Services [Member]
Net sales	65,695	50,606	128,589	96,835
Other Products and Services [Member] | Domestic [Member]
Net sales	57,151	42,578	109,795	78,951
Other Products and Services [Member] | International [Member]
Net sales	$ 8,544	$ 8,028	$ 18,794	$ 17,884

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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