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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales | $ 24,502,272 | $ 18,388,381 | $ 19,280,770 | $ 20,149,845 | $ 24,100,498 | $ 18,628,362 | $ 19,552,905 | $ 20,672,227 | $ 82,321,268 | $ 82,923,992 | $ 84,161,200
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 70,453,773 | 70,886,401 | 72,061,009
CANADA |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,224,894 | 7,199,155 | 7,543,468
All Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 4,642,601 | $ 4,838,436 | $ 4,556,723

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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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