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Note 4 - Fair Value Measurements (Tables) | 12 Months Ended
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Jan. 31, 2017
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  |  | Cost |  |  |  | Gross Unrealized Gains |  |  |  | Gross Unrealized (Losses) |  |  |  | Estimated Fair Value |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Marketable Securities |  |  | 4,667 |  |  |  | - |  |  |  | (28 | ) |  |  | 4,639 |
Schedule of Derivative Assets at Fair Value [Table Text Block] |
|  |  | Fair Value of Derivatives Designated as Hedge Instruments |  |  |  | Fair Value of Derivatives Not Designated As Hedge Instruments |  |  |  | Fair Value |
Derivative assets: |  |  |  |  |  |  |  |  |  |  |  |
Equity contracts |  |  | - |  |  |  | 497 |  |  |  | 497 |

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