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Note 6 - Net Income Per Share (Tables) | 9 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three M onths E nded December 31, |  |  | Nine M onths E nded December 31, |
|  | 2014 |  |  | 201 3 |  |  | 2014 |  |  | 2013 |
Net income available for shareholders |  | $ | 2,403 |  |  | $ | 1,746 |  |  | $ | 7,344 |  |  | $ | 5,538 |
Weighted average outstanding shares of common stock |  |  | 3,532 |  |  |  | 3,434 |  |  |  | 3,513 |  |  |  | 3,414 |
Dilutive effect of stock options |  |  | 122 |  |  |  | 203 |  |  |  | 136 |  |  |  | 177 |
Common stock and equivalents |  |  | 3,654 |  |  |  | 3,637 |  |  |  | 3,649 |  |  |  | 3,591 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.68 |  |  | $ | 0.51 |  |  | $ | 2.09 |  |  | $ | 1.62 |
Diluted |  |  | 0.66 |  |  |  | 0.48 |  |  |  | 2.01 |  |  |  | 1.54 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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