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Note 5 - Stock-Based Compensation (Tables) | 6 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months E nded September 30, |  |  | Six Months E nded September 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Total cost of stock-based compensation charged against income before income taxes |  | $ | 237 |  |  | $ | 208 |  |  | $ | 516 |  |  | $ | 357 |
Amount of income tax benefit recognized in earnings |  |  | 84 |  |  |  | 71 |  |  |  | 182 |  |  |  | 130 |
Amount charged against net income |  | $ | 153 |  |  | $ | 137 |  |  |  | 334 |  |  |  | 227 |
Impact on net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.04 |  |  | $ | 0.04 |  |  | $ | 0.10 |  |  | $ | 0.07 |
Diluted |  |  | 0.04 |  |  |  | 0.04 |  |  | $ | 0.09 |  |  |  | 0.06 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted- A verage Exercise Price per Share |  |  | Weighted- A verage Remaining Contractual Term |  |  | Aggregate Intrinsic Value (000s) |
Outstanding at March 31, 2014 |  |  | 398,172 |  |  | $ | 38.75 |  |  |  | 4.4 |  |  | $ | 20,505 |
Stock options granted |  |  | 145,400 |  |  |  | 89.11 |  |  |  | 7.5 |  |  |  |  |
Stock options forfeited |  |  | (25,916 | ) |  |  | 64.09 |  |  |  |  |  |  |  |  |
Stock options expired |  |  | -- |  |  |  | -- |  |  |  |  |  |  |  |  |
Stock options exercised |  |  | (36,198 | ) |  |  | 29.25 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2014 |  |  | 481,458 |  |  |  | 53.23 |  |  |  | 5.0 |  |  |  | 6,595 |
Exercisable at September 30, 2014 |  |  | 200,640 |  |  |  | 31.41 |  |  |  | 3.3 |  |  |  | 5,291 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | Number of Shares |  |  | Weighted-A verage Grant-Date Fair Value |
Unvested at March 31, 2014 |  |  | 257,347 |  |  | $ | 11.86 |
Stock options granted |  |  | 145,400 |  |  |  | 24.23 |
Stock options forfeited |  |  | (25,916 | ) |  |  | 17.15 |
Stock options vested |  |  | (96,013 | ) |  |  | 10.04 |
Unvested at September 30, 2014 |  |  | 280,818 |  |  |  | 18.32 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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