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Note 10 - Stock-based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended March 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Total cost of stock based compensation |  |  |  |  |  |  |  |  |  |  |  |
charged against income before income tax |  | $ | 1,411 |  |  | $ | 1,327 |  |  | $ | 993 |
Amount of income tax benefit recognized in earnings |  |  | 307 |  |  |  | 374 |  |  |  | 373 |
Amount charged against net income |  | $ | 1,104 |  |  | $ | 953 |  |  | $ | 620 |
Impact on net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.30 |  |  | $ | 0.26 |  |  | $ | 0.18 |
Diluted |  |  | 0.29 |  |  |  | 0.25 |  |  |  | 0.17 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year E nded March 31, |
|  | 2017 |  |  | 201 6 |  |  | 201 5 |
Volatility |  | 32.05% | - | 33.76% |  |  | 27.1% | - | 30.2% |  |  | 24.4% | - | 27.1% |
Risk-free interest rate |  |  | 1.22% |  |  |  |  | 1.09% |  |  |  | 1.9% | - | 2.3% |
Expected option life (years) |  |  | 5 |  |  |  |  | 8 |  |  |  | 6 | - | 8 |
Dividend yield |  |  | .55% |  |  |  |  | .7% |  |  |  |  | .9% |  |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted- A verage Exercise Price |  |  | Weighted- A verage Remaining Contractual Term |  |  | Aggregate Intrinsic Value (000s) |
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 |
Granted |  |  | 184,030 |  |  |  | 72.89 |  |  |  | 6.7 |  |  |  | -- |
Forfeited |  |  | (16,334 | ) |  |  | 75.16 |  |  |  | 6.5 |  |  |  | -- |
Expired |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (89,224 | ) |  |  | 38.28 |  |  |  | -- |  |  |  | -- |
Outstanding at March 31, 2016 |  |  | 515,720 |  |  |  | 64.32 |  |  |  | 5.2 |  |  |  | 16,561 |
Granted |  |  | 134,955 |  |  |  | 102.52 |  |  |  | 5.5 |  |  |  | -- |
Forfeited |  |  | (35,015 | ) |  |  | 87.5 |  |  |  | 4.5 |  |  |  | -- |
Expired |  |  | (904 | ) |  |  | 41.51 |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (104,395 | ) |  |  | 50.12 |  |  |  | -- |  |  |  | -- |
Outstanding at March 31, 2017 |  |  | 510,361 |  |  |  | 75.78 |  |  |  | 5.0 |  |  |  | 23,956 |
Exercisable at March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  | 136,595 |  |  |  | 50.61 |  |  |  | 3.9 |  |  |  | 9,847 |
2016 |  |  | 157,457 |  |  |  | 42.49 |  |  |  | 3.6 |  |  |  | 8,481 |
2015 |  |  | 163,210 |  |  |  | 33.35 |  |  |  | 3.6 |  |  |  | 6,341 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Unvested Shares |  |  | Weighted- average Grant-D ate Fair Value |
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 |
Options granted |  |  | 184,030 |  |  |  | 18.78 |
Options forfeited |  |  | (16,334 | ) |  |  | 19.07 |
Options vested |  |  | (83,471 | ) |  |  | 14.65 |
Unvested at March 31, 2016 |  |  | 358,263 |  |  |  | 19.46 |
Options granted |  |  | 134,955 |  |  |  | 31.27 |
Options forfeited |  |  | (35,015 | ) |  |  | 22.64 |
Options vested |  |  | (84,437 | ) |  |  | 16.96 |
Unvested at March 31, 2017 |  |  | 373,766 |  |  |  | 22.49 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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