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Note 14 - Segment Information (Detail) - Net sales for geographic areas were as follows: (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Geographic locations | $ 72,720,624 | $ 66,102,947 | $ 59,892,870
United States [Member] |  |  |
Geographic locations | 61,041,650 | 56,337,737 | 51,561,070
Canada [Member] |  |  |
Geographic locations | 7,496,840 | 6,714,100 | 5,862,857
All Other Countries [Member] |  |  |
Geographic locations | 4,182,134 | 3,051,110 | 2,468,943
Total [Member] |  |  |
Geographic locations | $ 72,720,624 | $ 66,102,947 | $ 59,892,870

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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=6880815&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
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration