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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