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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 701,355	$ 601,135	$ 1,724,118	$ 1,613,404
Domestic [Member]
Net sales	606,875	494,810	1,443,680	1,272,840
International [Member]
Net sales	94,480	106,325	280,438	340,564
Residential Power Products [Member]
Net sales	458,877	335,029	1,057,848	821,233
Residential Power Products [Member] | Domestic [Member]
Net sales	441,532	322,134	1,013,219	778,733
Residential Power Products [Member] | International [Member]
Net sales	17,345	12,895	44,629	42,500
Commercial and Industrial Power Products [Member]
Net sales	176,200	214,905	503,156	654,458
Commercial and Industrial Power Products [Member] | Domestic [Member]
Net sales	108,774	132,491	294,940	390,514
Commercial and Industrial Power Products [Member] | International [Member]
Net sales	67,426	82,414	208,216	263,944
Other Products and Services [Member]
Net sales	66,278	51,201	163,114	137,713
Other Products and Services [Member] | Domestic [Member]
Net sales	56,569	40,185	135,521	103,593
Other Products and Services [Member] | International [Member]
Net sales	$ 9,709	$ 11,016	$ 27,593	$ 34,120

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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