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Note 14 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 1 4 . QUARTERLY FINANCIAL DATA (UNAUDITED)
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
20 1 7 |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
Net sales |  | $ | 20,149,845 |  |  | $ | 19,280,770 |  |  | $ | 18,388,381 |  |  | $ | 24,502,272 |
Gross profit |  |  | 12,286,045 |  |  |  | 12,895,534 |  |  |  | 11,635,331 |  |  |  | 15,296,919 |
Net income |  |  | 1,231,265 |  |  |  | 1,027,732 |  |  |  | 521,414 |  |  |  | 1,671,340 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.13 |  |  | $ | 0.11 |  |  | $ | 0.06 |  |  | $ | 0.18 |
Diluted |  | $ | 0.13 |  |  | $ | 0.11 |  |  | $ | 0.06 |  |  | $ | 0.18 |
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 9,308,726 |  |  |  | 9,225,960 |  |  |  | 9,270,862 |  |  |  | 9,270,862 |
Diluted |  |  | 9,330,919 |  |  |  | 9,229,129 |  |  |  | 9,273,950 |  |  |  | 9,272,330 |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
20 1 6 |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
Net sales |  | $ | 20,672,227 |  |  | $ | 19,552,905 |  |  | $ | 18,628,362 |  |  | $ | 24,100,498 |
Gross profit |  |  | 12,652,746 |  |  |  | 12,895,790 |  |  |  | 11,644,871 |  |  |  | 14,519,835 |
Net income |  |  | 1,520,997 |  |  |  | 1,820,915 |  |  |  | 1,000,350 |  |  |  | 2,059,997 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.16 |  |  | $ | 0.19 |  |  | $ | 0.11 |  |  | $ | 0.23 |
Diluted |  | $ | 0.16 |  |  | $ | 0.19 |  |  | $ | 0.11 |  |  | $ | 0.23 |
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 9,698,951 |  |  |  | 9,209,446 |  |  |  | 9,188,483 |  |  |  | 9,188,483 |
Diluted |  |  | 9,718,453 |  |  |  | 9,227,941 |  |  |  | 9,206,382 |  |  |  | 9,301,867 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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