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Note 18 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | ---
Accrued liabilities not currently deductible | $ 4,471 | $ 14,838
Accumulated net operating losses | 12,866 | 10,579
Corporate minimum taxes | 1,596 |
Difference between tax and accounting basis of property and equipment | 23,754 | 33,929
Research and development and other tax credits and expenses | 1,649 | 756
Total deferred income tax assets | 44,336 | 60,102
Difference between tax and accounting basis of intangible assets | (45,030) | (41,381)
Difference between tax and accounting basis of property and equipment |  |
Other temporary differences | (2,109) | (1,716)
Total deferred income tax liabilities | (47,139) | (43,097)
Net deferred income taxes | (2,803) | 17,005
Valuation allowance | (11,365) | (10,470)
Net deferred income taxes, net of valuation allowance | $ (14,168) | $ 6,535

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