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Note 8 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net sales | $ 494,949 | $ 394,875 | $ 892,583 | $ 725,360
Domestic [Member] |  |  |  |
Net sales | 381,047 | 305,406 | 681,266 | 552,574
International [Member] |  |  |  |
Net sales | 113,902 | 89,469 | 211,317 | 172,786
Residential Power Products [Member] |  |  |  |
Net sales | 246,398 | 198,468 | 436,872 | 352,685
Residential Power Products [Member] | Domestic [Member] |  |  |  |
Net sales | 234,131 | 185,114 | 410,816 | 326,815
Residential Power Products [Member] | International [Member] |  |  |  |
Net sales | 12,267 | 13,354 | 26,056 | 25,870
Commercial and Industrial Power Products [Member] |  |  |  |
Net sales | 215,628 | 169,903 | 390,753 | 320,656
Commercial and Industrial Power Products [Member] | Domestic [Member] |  |  |  |
Net sales | 120,521 | 98,909 | 218,292 | 183,674
Commercial and Industrial Power Products [Member] | International [Member] |  |  |  |
Net sales | 95,107 | 70,994 | 172,461 | 136,982
Other Products and Services [Member] |  |  |  |
Net sales | 32,923 | 26,504 | 64,958 | 52,019
Other Products and Services [Member] | Domestic [Member] |  |  |  |
Net sales | 26,395 | 21,383 | 52,158 | 42,085
Other Products and Services [Member] | International [Member] |  |  |  |
Net sales | $ 6,528 | $ 5,121 | $ 12,800 | $ 9,934

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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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