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Note 11 - Net Income Per Share (Tables) | 12 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended March 31, |
|  | 201 5 |  |  | 201 4 |  |  | 201 3 |
Net income available for stockholders |  | $ | 9,583 |  |  | $ | 9,000 |  |  | $ | 8,450 |
Weighted average outstanding shares of common stock |  |  | 3,521 |  |  |  | 3,445 |  |  |  | 3,357 |
Dilutive effect of stock options |  |  | 129 |  |  |  | 166 |  |  |  | 236 |
Common stock and equivalents |  |  | 3,650 |  |  |  | 3,611 |  |  |  | 3,593 |
Net Income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.72 |  |  | $ | 2.61 |  |  | $ | 2.52 |
Diluted |  |  | 2.63 |  |  |  | 2.49 |  |  |  | 2.35 |

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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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