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Note 7 - Segment Information (Details) - Net sales for geographic areas: (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations | $ 18,524,604 | $ 17,000,728 | $ 56,735,444 | $ 52,082,061
United States [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 15,466,317 | 14,221,642
United States [Member] | Nine Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 47,404,281 | 43,861,288
Canada [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 1,889,696 | 1,761,960
Canada [Member] | Nine Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 5,728,405 | 5,214,782
All Other Countries [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 1,168,591 | 1,017,126
All Other Countries [Member] | Nine Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 3,602,758 | 3,005,991
Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 18,524,604 | 17,000,728
Nine Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | $ 56,735,444 | $ 52,082,061

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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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