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Note 16 - Quarterly Financial Data (Unaudited) (Detail) - Summary of Quarterly Financial Data (Unaudited) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Gross profit (in Dollars) | $ 45,905,674 | $ 40,337,159 | $ 36,250,857
Net income from continuing operations (in Dollars) | 5,596,070 | 4,753,969 | 4,158,491
Net income (in Dollars) | 5,596,070 | 4,752,601 | 4,160,257
Basic | $ 0.55 | $ 0.47 | $ 0.41
Diluted | $ 0.55 | $ 0.47 | $ 0.41
Basic | $ 0.55 | $ 0.47 | $ 0.41
Diluted | $ 0.55 | $ 0.47 | $ 0.41
Diluted (in Shares) | 10,175,346 | 10,182,098 | 10,251,863
First Quarter [Member] |  |  |
Net sales (in Dollars) | 18,177,078 | 15,879,040 |
Gross profit (in Dollars) | 11,365,633 | 9,524,848 |
Net income from continuing operations (in Dollars) | 1,574,105 | 1,150,576 |
Net income (in Dollars) | 1,574,105 | 1,150,576 |
Basic | $ 0.15 | $ 0.11 |
Diluted | $ 0.15 | $ 0.11 |
Basic | $ 0.15 | $ 0.11 |
Diluted | $ 0.15 | $ 0.11 |
Basic (in Shares) | 10,156,442 | 10,156,442 |
Diluted (in Shares) | 10,172,950 | 10,169,701 |
Second Quarter [Member] |  |  |
Net sales (in Dollars) | 16,904,254 | 15,933,921 |
Gross profit (in Dollars) | 10,940,201 | 9,845,254 |
Net income from continuing operations (in Dollars) | 1,539,639 | 1,076,356 |
Net income (in Dollars) | 1,539,639 | 1,076,356 |
Basic | $ 0.15 | $ 0.11 |
Diluted | $ 0.15 | $ 0.11 |
Basic | $ 0.15 | $ 0.11 |
Diluted | $ 0.15 | $ 0.11 |
Basic (in Shares) | 10,156,442 | 10,156,442 |
Diluted (in Shares) | 10,172,171 | 10,168,098 |
Third Quarter [Member] |  |  |
Net sales (in Dollars) | 17,000,728 | 15,385,421 |
Gross profit (in Dollars) | 10,404,770 | 9,238,278 |
Net income from continuing operations (in Dollars) | 280,770 | 830,474 |
Net income (in Dollars) | 280,770 | 829,106 |
Basic | $ 0.03 | $ 0.08 |
Diluted | $ 0.03 | $ 0.08 |
Basic | $ 0.03 | $ 0.08 |
Diluted | $ 0.03 | $ 0.08 |
Basic (in Shares) | 10,156,442 | 10,156,442 |
Diluted (in Shares) | 10,177,466 | 10,168,326 |
Fourth Quarter [Member] |  |  |
Net sales (in Dollars) | 20,638,564 | 18,904,565 |
Gross profit (in Dollars) | 13,195,070 | 11,728,779 |
Net income from continuing operations (in Dollars) | 2,201,556 | 1,696,563 |
Net income (in Dollars) | $ 2,201,556 | $ 1,696,563 |
Basic | $ 0.22 | $ 0.17 |
Diluted | $ 0.22 | $ 0.17 |
Basic | $ 0.22 | $ 0.17 |
Diluted | $ 0.22 | $ 0.17 |
Basic (in Shares) | 10,159,877 | 10,156,442 |
Diluted (in Shares) | 10,178,759 | 10,166,658 |

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