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Note 12 - Segment Information - Net Sales for Geographic Areas (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 24,100,498 | $ 18,628,362 | $ 19,552,905 | $ 20,672,227 | $ 24,292,971 | $ 19,355,937 | $ 19,773,528 | $ 20,788,764 | $ 82,923,992 | $ 84,161,200 | $ 83,430,912
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 70,886,401 | 72,061,009 | 69,791,099
CANADA |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,199,155 | 7,543,468 | 8,342,896
All Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 4,838,436 | $ 4,556,723 | $ 5,296,917

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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=63488584&loc=d3e20235-122688 + Details
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