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Note 6 - Net Sales by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Residential Power Products [Member] |  |  |
Net sales | $ 673,764 | $ 722,206 | $ 843,727
Commercial and Industrial Power Products [Member] |  |  |
Net sales | 548,440 | 652,216 | 569,890
Other Products and Services [Member] |  |  |
Net sales | 95,095 | 86,497 | 72,148
Net sales | $ 1,317,299 | $ 1,460,919 | $ 1,485,765

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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