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Note 17 - Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Quarterly Financial Information [Table Text Block] |
|  | 2020 |
|  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Total Year |
Net sales |  | $ | 55,720 |  |  | $ | 56,186 |  |  | $ | 77,785 |  |  | $ | 87,618 |  |  | $ | 277,309 |
Gross margin |  | $ | 19,320 |  |  | $ | 19,462 |  |  | $ | 29,832 |  |  | $ | 36,121 |  |  | $ | 104,735 |
Net income |  | $ | 1,188 |  |  | $ | 2,442 |  |  | $ | 7,613 |  |  | $ | 9,721 |  |  | $ | 20,964 |
Dividends paid |  | $ | 1,030 |  |  | $ | 1,023 |  |  | $ | 1,023 |  |  | $ | 1,017 |  |  | $ | 4,093 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.16 |  |  | $ | 0.33 |  |  | $ | 1.04 |  |  | $ | 1.34 |  |  | $ | 2.87 |
Diluted |  | $ | 0.16 |  |  | $ | 0.33 |  |  | $ | 1.04 |  |  | $ | 1.33 |  |  | $ | 2.86 |
|  | 2019 |
|  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Total Year |
Net sales |  | $ | 65,929 |  |  | $ | 61,959 |  |  | $ | 67,179 |  |  | $ | 75,341 |  |  | $ | 270,408 |
Gross margin |  | $ | 22,978 |  |  | $ | 21,441 |  |  | $ | 25,014 |  |  | $ | 28,252 |  |  | $ | 97,685 |
Net income |  | $ | 3,605 |  |  | $ | 3,156 |  |  | $ | 5,616 |  |  | $ | 5,085 |  |  | $ | 17,462 |
Dividends paid |  | $ | 887 |  |  | $ | 1,035 |  |  | $ | 1,036 |  |  | $ | 1,029 |  |  | $ | 3,987 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.49 |  |  | $ | 0.43 |  |  | $ | 0.76 |  |  | $ | 0.68 |  |  | $ | 2.36 |
Diluted |  | $ | 0.48 |  |  | $ | 0.42 |  |  | $ | 0.75 |  |  | $ | 0.70 |  |  | $ | 2.35 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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