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Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 1,067,071	$ 942,698	$ 919,981	$ 807,434	$ 761,082	$ 701,355	$ 546,848	$ 475,915	$ 3,737,184	$ 2,485,200	$ 2,204,336
Domestic [Member]
Net sales									3,164,050	2,088,808	1,742,898
International [Member]
Net sales									573,134	396,392	461,438
Residential Power Products [Member]
Net sales									2,456,765	1,556,501	1,143,723
Residential Power Products [Member] | Domestic [Member]
Net sales									2,366,908	1,495,383	1,086,019
Residential Power Products [Member] | International [Member]
Net sales									89,857	61,118	57,704
Commercial and Industrial Power Products [Member]
Net sales									998,998	701,751	871,595
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales									556,520	404,867	513,482
Commercial and Industrial Power Products [Member] | International [Member]
Net sales									442,478	296,884	358,113
Other Products and Services [Member]
Net sales									281,421	226,948	189,018
Other Products and Services [Member] | Domestic [Member]
Net sales									240,622	188,558	143,397
Other Products and Services [Member] | International [Member]
Net sales									$ 40,799	$ 38,390	$ 45,621

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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