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Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 31, 2023 | Jan. 31, 2022
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Income Taxes |  |
Accrued liabilities not currently deductible | $ 5,506 | $ 5,408
Accumulated net operating losses | 7,577 | 10,594
Corporate minimum taxes |  | 2,346
Difference between tax and accounting basis of property and equipment | 7,400 | 12,021
Research and development expenditures and tax credits | 3,339 | 1,172
Total deferred income tax assets | 23,822 | 31,541
Difference between tax and accounting basis of property and equipment | (42,958) | (47,255)
Temporary difference on equity derivative | (3,077) | (2,886)
Total deferred income tax liabilities | (46,035) | (50,141)
Net deferred income taxes | (22,213) | (18,600)
Valuation allowance | (1,704) | (1,961)
Net deferred income taxes, net of valuation allowance | $ (23,917) | $ (20,561)

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