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Note 17 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | ---
Accruals not currently deductible | $ 9,060 | $ 11,975
Accumulated net operating losses | 13,868 | 17,571
Corporate minimum taxes |  | 1,767
Research and development and other tax credits and expenses | 1,580 | 3,424
Other timing differences |  | 683
Total deferred income tax assets | 24,508 | 35,420
Difference between tax and accounting basis of intangible assets | (12,976) | (23,393)
Difference between tax and accounting basis of property and equipment | (6,933) | (2,655)
Uncertain tax positions incurred in loss years | (133) | (205)
Other timing differences | (134) |
Total deferred income tax liabilities | (20,176) | (26,253)
Net deferred income taxes | 4,332 | 9,167
Valuation allowance | (11,257) | (12,115)
Net deferred income taxes, net of valuation allowance | $ (6,925) | $ (2,948)

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