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Note 8 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net sales | $ 559,515 | $ 455,839 | $ 1,452,098 | $ 1,181,199
Domestic [Member] |  |  |  |
Net sales | 453,259 | 362,909 | 1,134,525 | 915,483
International [Member] |  |  |  |
Net sales | 106,256 | 92,930 | 317,573 | 265,716
Residential Power Products [Member] |  |  |  |
Net sales | 311,918 | 251,203 | 748,790 | 603,888
Residential Power Products [Member] | Domestic [Member] |  |  |  |
Net sales | 300,387 | 236,821 | 711,203 | 563,636
Residential Power Products [Member] | International [Member] |  |  |  |
Net sales | 11,531 | 14,382 | 37,587 | 40,252
Commercial and Industrial Power Products [Member] |  |  |  |
Net sales | 206,366 | 173,842 | 597,119 | 494,498
Commercial and Industrial Power Products [Member] | Domestic [Member] |  |  |  |
Net sales | 121,952 | 101,122 | 340,244 | 284,796
Commercial and Industrial Power Products [Member] | International [Member] |  |  |  |
Net sales | 84,414 | 72,720 | 256,875 | 209,702
Other Products and Services [Member] |  |  |  |
Net sales | 41,231 | 30,794 | 106,189 | 82,813
Other Products and Services [Member] | Domestic [Member] |  |  |  |
Net sales | 30,920 | 24,966 | 83,078 | 67,051
Other Products and Services [Member] | International [Member] |  |  |  |
Net sales | $ 10,311 | $ 5,828 | $ 23,111 | $ 15,762

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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