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Note 9 - Stock-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year E nded March 31, |
|  | 2015 |  |  | 201 4 |  |  | 201 3 |
Total cost of stock based compensation charged against income before income tax |  | $ | 993 |  |  | $ | 840 |  |  | $ | 1,112 |
Amount of income tax benefit recognized in earnings |  |  | 373 |  |  |  | 263 |  |  |  | 388 |
Amount charged against net income |  | $ | 620 |  |  | $ | 577 |  |  | $ | 724 |
Impact on net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.18 |  |  | $ | 0.17 |  |  | $ | 0.22 |
Diluted |  |  | 0.17 |  |  |  | 0.16 |  |  |  | 0.20 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| Year E nded March 31,
| 2015 | 201 4 | 201 3
Volatility | 24.4% | - | 27.1% | 26% | - | 28.7% | 27.5 | - | 31.1%
Risk-free interest rate | 1.9% | - | 2.3% | 0.8% | - | 2.1% | 0.6 | - | 1.0%
Expected option life (years) | 6 | - | 8 | 5 | - | 10 | 5 | - | 10
Dividend yield |  | 0.9% |  |  | 1.1% |  |  | 1.4% |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted- average Exercise Price |  |  | Weighted- average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (000s) |
Outstanding at March 31, 2012 |  |  | 433,785 |  |  | $ | 22.77 |  |  |  | 3.9 |  |  | $ | 11,516 |
Granted |  |  | 116,080 |  |  |  | 49.97 |  |  |  | 5.9 |  |  |  | -- |
Forfeited |  |  | (40,375 | ) |  |  | 32.87 |  |  |  | -- |  |  |  | -- |
Expired |  |  | (40 | ) |  |  | 18.98 |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (93,325 | ) |  |  | 20.56 |  |  |  | -- |  |  |  | -- |
Outstanding at March 31, 2013 |  |  | 416,125 |  |  |  | 29.87 |  |  |  | 3.7 |  |  |  | 9,529 |
Granted |  |  | 128,124 |  |  |  | 55.33 |  |  |  | 6.4 |  |  |  | -- |
Forfeited |  |  | (27,782 | ) |  |  | 52.50 |  |  |  | -- |  |  |  | -- |
Expired |  |  | (410 | ) |  |  | 52.50 |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (117,885 | ) |  |  | 22.17 |  |  |  | -- |  |  |  | -- |
Outstanding at March 31, 2014 |  |  | 398,172 |  |  |  | 38.75 |  |  |  | 4.4 |  |  |  | 20,505 |
Granted |  |  | 147,720 |  |  |  | 88.62 |  |  |  | 7.0 |  |  |  | -- |
Forfeited |  |  | (26,466 | ) |  |  | 64.62 |  |  |  | -- |  |  |  | -- |
Expired |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (82,178 | ) |  |  | 28.87 |  |  |  | -- |  |  |  | -- |
Outstanding at March 31, 2015 |  |  | 437,248 |  |  |  | 55.81 |  |  |  | 4.9 |  |  |  | 9,445 |
Exercisable at March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  | 163,210 |  |  |  | 33.35 |  |  |  | 3.6 |  |  |  | 6,341 |
2014 |  |  | 140,825 |  |  |  | 26.70 |  |  |  | 3.5 |  |  |  | 8,949 |
2013 |  |  | 158,320 |  |  |  | 21.00 |  |  |  | 3.0 |  |  |  | 5,031 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Unvested Shares |  |  | Weighted-a verage Grant-date Fair Value |
Unvested at March 31, 2012 |  |  | 284,875 |  |  | $ | 7.28 |
Options granted |  |  | 116,065 |  |  |  | 12.43 |
Options forfeited |  |  | (38,720 | ) |  |  | 8.86 |
Options vested |  |  | (104,415 | ) |  |  | 6.69 |
Unvested at March 31, 2013 |  |  | 257,805 |  |  |  | 9.55 |
Options granted |  |  | 128,124 |  |  |  | 15.90 |
Options forfeited |  |  | (27,782 | ) |  |  | 14.75 |
Options vested |  |  | (100,800 | ) |  |  | 8.53 |
Unvested at March 31, 2014 |  |  | 257,347 |  |  |  | 11.86 |
Options granted |  |  | 147,720 |  |  |  | 24.49 |
Options forfeited |  |  | (26,466 | ) |  |  | 17.29 |
Options vested |  |  | (104,563 | ) |  |  | 10.36 |
Unvested at March 31, 2015 |  |  | 274,038 |  |  |  | 18.42 |

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