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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
	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

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