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Note 18 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Jan. 31, 2019
--- | --- | ---
Accrued liabilities not currently deductible | $ 14,838 | $ 11,483
Accumulated net operating losses | 10,579 | 11,081
Difference between tax and accounting basis of property and equipment | 33,929 |
Research and development and other tax credits and expenses | 756 | 911
Total deferred income tax assets | 60,102 | 23,475
Difference between tax and accounting basis of intangible assets | (41,381) | (23,974)
Difference between tax and accounting basis of property and equipment |  | (909)
Other temporary differences | (1,716) | (574)
Total deferred income tax liabilities | (43,097) | (25,457)
Net deferred income taxes | 17,005 | (1,982)
Valuation allowance | (10,470) | (9,927)
Net deferred income taxes, net of valuation allowance | $ 6,535 | $ (11,909)

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