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Note 14 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 14. QUARTERLY FINANCIAL DATA (UNAUDITED)
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
20 16 |  | 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 |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
20 15 |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
Net sales |  | $ | 20,788,764 |  |  | $ | 19,773,528 |  |  | $ | 19,355,937 |  |  | $ | 24,292,971 |
Gross profit |  |  | 12,582,927 |  |  |  | 12,814,382 |  |  |  | 11,832,697 |  |  |  | 14,841,054 |
Net income |  |  | 1,444,407 |  |  |  | 1,507,896 |  |  |  | 1,111,344 |  |  |  | 2,338,758 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.14 |  |  | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | 0.24 |
Diluted |  | $ | 0.14 |  |  | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | 0.24 |
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 10,211,333 |  |  |  | 10,212,933 |  |  |  | 10,175,650 |  |  |  | 9,692,860 |
Diluted |  |  | 10,241,096 |  |  |  | 10,241,164 |  |  |  | 10,199,092 |  |  |  | 9,712,571 |

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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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