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Note 7 - Segment Information (Details) - Net sales for geographic areas were as follows: (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations | $ 18,973,013 | $ 16,904,254 | $ 38,210,840 | $ 35,081,332
United States [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 15,741,570 | 14,112,191
United States [Member] | Six Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 31,937,964 | 29,639,646
Canada [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 1,918,986 | 1,732,982
Canada [Member] | Six Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 3,838,709 | 3,452,822
All Other Countries [Member] | Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 1,312,457 | 1,059,081
All Other Countries [Member] | Six Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 2,434,167 | 1,988,864
Three Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | 18,973,013 | 16,904,254
Six Months [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographic locations |  |  | $ 38,210,840 | $ 35,081,332

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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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