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Note 16 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Quarterly Financial Information [Table Text Block] |
2012 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Net sales |  | $ | 18,177,078 |  |  | $ | 16,904,254 |  |  | $ | 17,000,728 |  |  | $ | 20,638,564 |
Gross profit |  |  | 11,365,633 |  |  |  | 10,940,201 |  |  |  | 10,404,770 |  |  |  | 13,195,070 |
Net income from continuing operations |  |  | 1,574,105 |  |  |  | 1,539,639 |  |  |  | 280,770 |  |  |  | 2,201,556 |
Net income |  |  | 1,574,105 |  |  |  | 1,539,639 |  |  |  | 280,770 |  |  |  | 2,201,556 |
Net income from continuing operations per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.15 |  |  |  | 0.15 |  |  |  | 0.03 |  |  |  | 0.22 |
Diluted |  |  | 0.15 |  |  |  | 0.15 |  |  |  | 0.03 |  |  |  | 0.22 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.15 |  |  |  | 0.15 |  |  |  | 0.03 |  |  |  | 0.22 |
Diluted |  |  | 0.15 |  |  |  | 0.15 |  |  |  | 0.03 |  |  |  | 0.22 |
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 10,156,442 |  |  |  | 10,156,442 |  |  |  | 10,156,442 |  |  |  | 10,159,877 |
Diluted |  |  | 10,172,950 |  |  |  | 10,172,171 |  |  |  | 10,177,466 |  |  |  | 10,178,759 |
2011 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Net sales |  | $ | 15,879,040 |  |  | $ | 15,933,921 |  |  | $ | 15,385,421 |  |  | $ | 18,904,565 |
Gross profit |  |  | 9,524,848 |  |  |  | 9,845,254 |  |  |  | 9,238,278 |  |  |  | 11,728,779 |
Net income from continuing operations |  |  | 1,150,576 |  |  |  | 1,076,356 |  |  |  | 830,474 |  |  |  | 1,696,563 |
Net income |  |  | 1,150,576 |  |  |  | 1,076,356 |  |  |  | 829,106 |  |  |  | 1,696,563 |
Net income from continuing operations per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.11 |  |  |  | 0.11 |  |  |  | 0.08 |  |  |  | 0.17 |
Diluted |  |  | 0.11 |  |  |  | 0.11 |  |  |  | 0.08 |  |  |  | 0.17 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.11 |  |  |  | 0.11 |  |  |  | 0.08 |  |  |  | 0.17 |
Diluted |  |  | 0.11 |  |  |  | 0.11 |  |  |  | 0.08 |  |  |  | 0.17 |
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 10,156,442 |  |  |  | 10,156,442 |  |  |  | 10,156,442 |  |  |  | 10,156,442 |
Diluted |  |  | 10,169,701 |  |  |  | 10,168,098 |  |  |  | 10,168,326 |  |  |  | 10,166,658 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration