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Note 18 - Segment Reporting - Depreciation and Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Depreciation and amortization | $ 26,754 | $ 18,474 | $ 17,485
UNITED STATES |  |  |
Depreciation and amortization | 21,117 | 13,267 | 12,533
Europe [Member] |  |  |
Depreciation and amortization | 4,679 | 4,174 | 3,386
JAPAN |  |  |
Depreciation and amortization | $ 958 | $ 1,033 | $ 1,566

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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