Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net sales	$ 1,173,563	$ 1,070,667	$ 3,061,033	$ 2,958,997
Residential Power Products [Member]
Net sales	722,787	565,087	1,690,136	1,482,538
Commercial and Industrial Power Products [Member]
Net sales	327,956	384,533	1,026,095	1,131,876
Other Products and Services [Member]
Net sales	122,820	121,047	344,802	344,583
Domestic [Member]
Net sales	1,011,347	886,365	2,541,242	2,395,292
Domestic [Member] | Residential Power Products [Member]
Net sales	701,781	539,775	1,629,100	1,389,112
Domestic [Member] | Commercial and Industrial Power Products [Member]
Net sales	199,339	238,212	606,147	700,941
Domestic [Member] | Other Products and Services [Member]
Net sales	110,227	108,378	305,995	305,239
International [Member]
Net sales	162,216	184,302	519,791	563,705
International [Member] | Residential Power Products [Member]
Net sales	21,006	25,312	61,036	93,426
International [Member] | Commercial and Industrial Power Products [Member]
Net sales	128,617	146,321	419,948	430,935
International [Member] | Other Products and Services [Member]
Net sales	$ 12,593	$ 12,669	$ 38,807	$ 39,344