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INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
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Assets: |  |
Net operating loss ("NOL") carryforwards | $ 3,487 | $ 3,345
Stock options | 1,594 | 2,354
Purchased intangibles | 1,592 | 2,233
Accrued expenses and others | 2,052 | 2,144
Total Assets | 8,725 | 10,076
Liabilities: |  |
Purchased intangibles | (4,428) | (4,375)
Construction contracts | (2,862) | (3,681)
Property and equipment and other | (2,389) | (2,244)
Total Liabilities | (9,679) | (10,300)
Net deferred tax liabilities | (954) | (224)
Net operating losses | 7,900 |
Prepaid income taxes | $ 3,900 | $ 3,300

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