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Note 7 - Segment Information (Details) - Net Sales for Geographic Areas (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographical locations | $ 19,703,607 | $ 18,973,013 | $ 39,542,073 | $ 38,210,840
UNITED STATES |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographical locations | 16,432,956 | 15,741,570 | 33,078,842 | 31,937,964
CANADA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographical locations | 2,030,752 | 1,918,986 | 3,926,810 | 3,838,709
All Other Countries [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Geographical locations | $ 1,239,899 | $ 1,312,457 | $ 2,536,421 | $ 2,434,167

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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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