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Income taxes Deferred income tax disclosure (Details) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | ---
Components of deferred income tax assets |  |
U.S. Federal NOL carryforward | $ 1,795 | $ 7,765
Deferred compensation | 341 | 346
Research tax credit | 2,703 | 2,703
Foreign NOL carryforward | 332 | 185
Foreign tax credit | 9,749 | 4,695
Stock compensation | 506 | 804
Other accruals not yet deducted | 270 | 514
State NOL carryforward | 2,157 | 1,574
Accrued commissions and incentives | 423 | 765
Inventory valuation allowance | 96 | 110
Other | 81 | 5
Deferred tax assets, gross | 18,453 | 19,466
Valuation allowance | (17,198) | (16,551)
Total deferred tax assets, net of valuation allowances | 1,255 | 2,915
Components of the deferred income tax liability |  |
Depreciation | (1,941) | (2,778)
Foreign subsidiaries unremitted earnings | (101) | (1,750)
Prepaid | (64) | (69)
Total deferred tax liabilities | (2,106) | (4,597)
Deferred tax liabilities, net | (851) | (1,682)
Balance sheet classification |  |
Deferred tax long-term assets | 391 | 147
Deferred tax long-term liabilities | $ (1,242) | $ (1,829)

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