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Note 17 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | ---
Accruals not currently deductible | $ 11,975 | $ 8,653
Accumulated net operating losses | 17,571 | 19,859
Corporate minimum taxes | 1,767 | 1,589
Research and development and other tax credits and expenses | 3,424 | 2,885
Other timing differences | 683 | 924
Total deferred income tax assets | 35,420 | 33,910
Difference between tax and accounting basis of intangible assets | (23,393) | (9,584)
Difference between tax and accounting basis of property and equipment | (2,655) |
Difference between tax and accounting basis of property and equipment |  | 700
Uncertain tax positions incurred in loss years | (205) | (356)
Total deferred income tax liabilities | (26,253) | (9,240)
Net deferred income taxes | 9,167 | 24,670
Valuation allowance | (12,115) | (13,963)
Net deferred income taxes, net of valuation allowance | $ (2,948) | $ 10,707

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