Note 4 - Segment Reporting (Details) - Net Sales by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Net sales	$ 362,609	$ 346,688	$ 704,617	$ 746,260
Residential Power Products [Member]
Revenue from External Customer [Line Items]
Net sales	179,592	196,616	343,561	451,860
Commercial and Industrial Power Products [Member]
Revenue from External Customer [Line Items]
Net sales	163,467	133,427	320,837	260,507
Other Products and Services [Member]
Revenue from External Customer [Line Items]
Net sales	$ 19,550	$ 16,645	$ 40,219	$ 33,893