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Note 17 - Income Taxes (Details) - Components of Deferred Income Tax Assets and Liabilities - USD ($) $ in Thousands | Jan. 31, 2016 | Jan. 31, 2015
--- | --- | ---
Assets |  |
Accruals not currently deductible | $ 8,653 | $ 4,238
Accumulated net operating losses | 19,859 | 22,617
Corporate minimum taxes | 1,589 | 1,710
Difference between tax and accounting basis of property and equipment | 700 | 7,031
Research and development and other tax credits and expenses | 2,885 | 2,792
Other timing differences | 924 | 1,508
Total deferred income tax assets | 34,610 | 39,896
Liabilities |  |
Difference between tax and accounting basis of intangible assets | (9,584) | (9,232)
Uncertain tax positions incurred in loss years | (356) | (530)
Total deferred income tax liabilities | (9,940) | (9,762)
Net deferred income taxes | 24,670 | 30,134
Valuation allowance | (13,963) | (14,681)
Net deferred income taxes, net of valuation allowance | $ 10,707 | $ 15,453

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