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Note 9 - Segment information (Details) - Revenue Attributable to the United States and Foreign Countries (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Note 9 - Segment information (Details) - Revenue Attributable to the United States and Foreign Countries [Line Items] |  |  |  |
Sales Revenue, Net | $ 106,063 | $ 103,237 | $ 198,228 | $ 188,964
United States [Member] |  |  |  |
Note 9 - Segment information (Details) - Revenue Attributable to the United States and Foreign Countries [Line Items] |  |  |  |
Sales Revenue, Net | 102,901 | 100,262 | 190,879 | 181,406
All Foreign Countries [Member] |  |  |  |
Note 9 - Segment information (Details) - Revenue Attributable to the United States and Foreign Countries [Line Items] |  |  |  |
Sales Revenue, Net | $ 3,162 | $ 2,975 | $ 7,349 | $ 7,558

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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