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Note 15 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Mar. 31, 2021
Notes Tables |
Quarterly Financial Information [Table Text Block] |
Quarter Ended: |  | June 30, 2020 |  |  | September 30, 2020 |  |  | December 31, 2020 |  |  | March 31, 2021 |
Sales |  | $ | 96,204 |  |  | $ | 75,436 |  |  | $ | 65,896 |  |  | $ | 71,679 |
Gross Profit |  | $ | 26,785 |  |  | $ | 23,018 |  |  | $ | 19,623 |  |  | $ | 20,522 |
Income from operations |  | $ | 9,436 |  |  | $ | 10,471 |  |  | $ | 9,293 |  |  | $ | 8,387 |
Net income |  | $ | 7,768 |  |  | $ | 8,412 |  |  | $ | 7,611 |  |  | $ | 6,812 |
Diluted net income per common share |  | $ | 0.39 |  |  | $ | 0.42 |  |  | $ | 0.38 |  |  | $ | 0.34 |
Quarter Ended: |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |  |  | March 31, 2020 |
Sales |  | $ | 79,988 |  |  | $ | 69,936 |  |  | $ | 59,915 |  |  | $ | 74,286 |
Gross Profit |  | $ | 21,861 |  |  | $ | 20,002 |  |  | $ | 17,697 |  |  | $ | 21,686 |
Income from operations |  | $ | 6,161 |  |  | $ | 8,371 |  |  | $ | 7,932 |  |  | $ | 8,513 |
Net income |  | $ | 5,343 |  |  | $ | 6,665 |  |  | $ | 6,840 |  |  | $ | 7,003 |
Diluted net income per common share |  | $ | 0.26 |  |  | $ | 0.33 |  |  | $ | 0.34 |  |  | $ | 0.35 |

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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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