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Note 9 - Net Income Per Share (Tables) | 12 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net income (numerator): |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 30,603 |  |  | $ | 25,851 |  |  | $ | 37,740 |
Shares (denominator) |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding used in basic computation |  |  | 20,060 |  |  |  | 20,041 |  |  |  | 20,461 |
Common shares issuable upon the vesting of restricted stock |  |  | 49 |  |  |  | 4 |  |  |  | 20 |
Common shares issuable upon conversion of preferred shares |  |  | 10 |  |  |  | 10 |  |  |  | 10 |
Shares used in diluted computation |  |  | 20,119 |  |  |  | 20,055 |  |  |  | 20,491 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.53 |  |  | $ | 1.29 |  |  | $ | 1.84 |
Diluted |  | $ | 1.52 |  |  | $ | 1.29 |  |  | $ | 1.84 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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