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Note 16 - Stock-based Compensation Plans (Tables) | 12 Months Ended
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Jan. 31, 2017
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
Year Ended |  |  | January 31, 2017 |  |  |  | January 31, 2016 |  |  |  | January 31, 2015 |
Cost of revenues |  |  | 40 |  |  |  | 24 |  |  |  | 45 |
Sales and marketing |  |  | 81 |  |  |  | 41 |  |  |  | 70 |
Research and development |  |  | 14 |  |  |  | - |  |  |  | 2 |
General and administrative |  |  | 1,887 |  |  |  | 1,512 |  |  |  | 1,426 |
Effect on net income |  |  | 2,022 |  |  |  | 1,577 |  |  |  | 1,543 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Year Ended |  |  | January 31, 2017 |  |  |  | January 31, 2016 |  |  |  | January 31, 2015 |
Expected dividend yield (%) |  |  | - |  |  |  | N/A |  |  |  | - |
Expected volatility (%) |  |  | 25.2 |  |  |  | N/A |  |  |  | 25.4 |
Risk-free rate (%) |  |  | 0.6 |  |  |  | N/A |  |  |  | 1.5 |
Expected option life (years) |  |  | 5 |  |  |  | N/A |  |  |  | 5 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  | Number of Stock Options Outstanding |  |  |  | Weighted- Average Exercise Price |  |  |  | Weighted- Average Remaining Contractual Life (years) |  |  |  | Aggregate Intrinsic Value (in millions) |
Balance at January 31, 2015 |  |  | 953,264 |  |  | $ | 6.33 |  |  |  | 2.5 |  |  |  | 10.6 |
Exercised |  |  | (37,500 | ) |  | $ | 4.18 |  |  |  |  |  |  |  |  |
Surrendered for Shares |  |  | (446,875 | ) |  | $ | 2.59 |  |  |  |  |  |  |  |  |
Balance at January 31, 2016 |  |  | 468,889 |  |  | $ | 8.25 |  |  |  | 3.5 |  |  |  | 5.2 |
Granted |  |  | 170,932 |  |  | $ | 19.06 |  |  |  |  |  |  |  |  |
Exercised |  |  | (113,500 | ) |  | $ | 4.93 |  |  |  |  |  |  |  |  |
Balance at January 31, 2017 |  |  | 526,321 |  |  | $ | 12.36 |  |  |  | 4.2 |  |  |  | 4.9 |
Vested or expected to vest at January 31, 2017 |  |  | 505,228 |  |  | $ | 12.20 |  |  |  | 4.2 |  |  |  | 4.7 |
Exercisable at January 31, 2017 |  |  | 286,529 |  |  | $ | 9.88 |  |  |  | 3.3 |  |  |  | 3.3 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  | Options Outstanding |  |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Weighted Average Exercise Price |  |  |  | Number of Stock Options |  |  |  | Weighted Average Remaining Contractual Life (years) |  |  |  | Weighted Average Exercise Price |  |  |  | Number of Stock Options |
$4.80 | – | $5.45 |  | $ | 4.84 |  |  |  | 108,389 |  |  |  | 1.1 |  |  | $ | 4.84 |  |  |  | 108,389 |
$6.79 | – | $6.79 |  | $ | 6.79 |  |  |  | 32,000 |  |  |  | 2.4 |  |  | $ | 6.79 |  |  |  | 24,000 |
$11.50 | – | $11.66 |  | $ | 11.65 |  |  |  | 215,000 |  |  |  | 4.4 |  |  | $ | 11.65 |  |  |  | 105,500 |
$18.81 | – | $20.45 |  | $ | 19.05 |  |  |  | 170,932 |  |  |  | 6.3 |  |  | $ | 18.81 |  |  |  | 48,640 |
|  |  |  | $ | 12.36 |  |  |  | 526,321 |  |  |  | 4.2 |  |  | $ | 9.88 |  |  |  | 286,529 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  |  | Number of Stock Options Outstanding |  |  |  | Weighted- Average Grant-Date Fair Value per Share |
Balance at January 31, 2015 |  |  | 123,854 |  |  | $ | 2.56 |
Vested |  |  | (70,276 | ) |  | $ | 1.92 |
Balance at January 31, 2016 |  |  | 53,578 |  |  | $ | 2.52 |
Granted |  |  | 170,932 |  |  | $ | 4.46 |
Vested |  |  | (72,218 | ) |  | $ | 3.70 |
Balance at January 31, 2017 |  |  | 152,292 |  |  | $ | 4.12 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] |
|  |  | Number of PSUs Outstanding |  |  |  | Weighted- Average Granted Date Fair Value |  |  |  | Weighted- Average Remaining Contractual Life (years) |  |  |  | Aggregate Intrinsic Value (in millions) |
Balance at January 31, 2015 |  |  | 174,258 |  |  | $ | 12.61 |  |  |  | 7.9 |  |  |  | 3.0 |
Granted |  |  | 49,187 |  |  | $ | 19.70 |  |  |  |  |  |  |  |  |
Performance units issued |  |  | 30,092 |  |  | $ | 9.34 |  |  |  |  |  |  |  |  |
Balance at January 31, 2016 |  |  | 253,537 |  |  | $ | 12.39 |  |  |  | 7.2 |  |  |  | 4.9 |
Granted |  |  | 54,480 |  |  | $ | 23.37 |  |  |  |  |  |  |  |  |
Performance units issued |  |  | 29,630 |  |  | $ | 9.26 |  |  |  |  |  |  |  |  |
Balance at January 31, 2017 |  |  | 337,647 |  |  | $ | 13.73 |  |  |  | 6.6 |  |  |  | 7.3 |
Vested or expected to vest at January 31, 2017 |  |  | 337,647 |  |  | $ | 13.73 |  |  |  | 6.6 |  |  |  | 7.3 |
Exercisable at January 31, 2017 |  |  | 233,980 |  |  | $ | 10.30 |  |  |  | 5.8 |  |  |  | 5.0 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  | Number of RSUs Outstanding |  |  |  | Weighted- Average Granted Date Fair Value |  |  |  | Weighted- Average Remaining Contractual Life (years) |  |  |  | Aggregate Intrinsic Value (in millions) |
Balance at January 31, 2015 |  |  | 175,592 |  |  | $ | 9.94 |  |  |  | 7.9 |  |  |  | 3.1 |
Granted |  |  | 49,187 |  |  | $ | 15.33 |  |  |  |  |  |  |  |  |
Balance at January 31, 2016 |  |  | 224,779 |  |  | $ | 10.03 |  |  |  | 7.4 |  |  |  | 4.3 |
Granted |  |  | 38,456 |  |  | $ | 18.81 |  |  |  |  |  |  |  |  |
Balance at January 31, 2017 |  |  | 263,235 |  |  | $ | 11.17 |  |  |  | 6.7 |  |  |  | 5.7 |
Vested or expected to vest at January 31, 2017 |  |  | 263,235 |  |  | $ | 11.17 |  |  |  | 6.7 |  |  |  | 5.7 |
Exercisable at January 31, 2017 |  |  | 221,201 |  |  | $ | 10.00 |  |  |  | 6.4 |  |  |  | 4.8 |
Schedule Of Cash Settled Restricted Share Unit Plan Activity [Table Text Block] |
|  |  | Number of CRSUs Outstanding |  |  |  | Weighted- Average Remaining Contractual Life (years) |
Balance at January 31, 2015 |  |  | 113,856 |  |  |  | 1.5 |
Granted |  |  | 72,817 |  |  |  |  |
Vested and settled in cash |  |  | (85,924 | ) |  |  |  |
Balance at January 31, 2016 |  |  | 100,749 |  |  |  | 1.6 |
Granted |  |  | 43,218 |  |  |  |  |
Vested and settled in cash |  |  | (66,638 | ) |  |  |  |
Balance at January 31, 2017 |  |  | 77,329 |  |  |  | 1.4 |
Non-vested at January 31, 2017 |  |  | 77,329 |  |  |  | 1.4 |

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