Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net sales	$ 998,197	$ 1,000,420	$ 1,887,470	$ 1,888,330
Residential Power Products [Member]
Net sales	538,399	498,587	967,349	917,450
Commercial and Industrial Power Products [Member]
Net sales	344,169	384,353	698,139	747,343
Other Products and Services [Member]
Net sales	115,629	117,480	221,982	223,537
Domestic [Member]
Net sales	817,558	804,539	1,529,895	1,508,927
Domestic [Member] | Residential Power Products [Member]
Net sales	515,166	468,184	927,319	849,336
Domestic [Member] | Commercial and Industrial Power Products [Member]
Net sales	200,315	234,605	406,808	462,729
Domestic [Member] | Other Products and Services [Member]
Net sales	102,077	101,750	195,768	196,862
International [Member]
Net sales	180,639	195,881	357,575	379,403
International [Member] | Residential Power Products [Member]
Net sales	23,233	30,403	40,030	68,114
International [Member] | Commercial and Industrial Power Products [Member]
Net sales	143,854	149,748	291,331	284,614
International [Member] | Other Products and Services [Member]
Net sales	$ 13,552	$ 15,730	$ 26,214	$ 26,675