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Note 18 - Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2017 |  | Q1 |  | Q2 |  | Q3 |  | Q4
Net sales |  | $ | 37,053 |  |  | $ | 37,886 |  |  | $ | 35,684 |  |  | $ | 37,220 |
Gross profit |  |  | 9,516 |  |  |  | 9,941 |  |  |  | 8,193 |  |  |  | 7,837 |
Net income |  |  | 2,171 |  |  |  | 2,630 |  |  |  | 1,695 |  |  |  | 2,714 |
Basic net income per share |  |  | 0.30 |  |  |  | 0.36 |  |  |  | 0.23 |  |  |  | 0.38 |
Diluted net income per share |  |  | 0.30 |  |  |  | 0.36 |  |  |  | 0.23 |  |  |  | 0.37 |
2016 |  | Q1 |  | Q2 |  | Q3 |  | Q4
Net sales |  | $ | 34,503 |  |  | $ | 37,902 |  |  | $ | 37,220 |  |  | $ | 36,507 |
Gross profit |  |  | 7,727 |  |  |  | 10,295 |  |  |  | 8,452 |  |  |  | 8,176 |
Net income |  |  | 1,075 |  |  |  | 2,735 |  |  |  | 2,669 |  |  |  | 1,491 |
Basic net income per share |  |  | 0.15 |  |  |  | 0.38 |  |  |  | 0.37 |  |  |  | 0.21 |
Diluted net income per share |  |  | 0.15 |  |  |  | 0.38 |  |  |  | 0.37 |  |  |  | 0.20 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=84173487&loc=d3e1280-108306 + Details
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