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Note 13 - Segment Information (Details) - Net Sales for Geographic Areas (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Geographic locations | $ 78,284,585 | $ 72,720,624 | $ 66,102,947
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Geographic locations | 65,371,652 | 61,041,650 | 56,337,737
CANADA |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Geographic locations | 8,004,320 | 7,496,840 | 6,714,100
All Other Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Geographic locations | $ 4,908,613 | $ 4,182,134 | $ 3,051,110

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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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