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Income taxes Income tax disclosure (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | ---
Components of deferred income tax assets |  |
U.S. Federal NOL carryforward | $ 9,348 | $ 3,044
Deferred compensation | 346 | 2,382
Research tax credit | 2,703 | 2,057
Foreign NOL carryforward | 186 | 231
Foreign tax credit | 4,695 | 2,861
Stock compensation | 804 | 1,061
Other accruals not yet deducted | 514 | 438
State NOL carryforward | 1,877 | 1,419
Accrued commissions and incentives | 765 | 723
Inventory valuation allowance | 110 | 73
Other | 4 | 116
Deferred tax assets, gross | 21,352 | 14,405
Valuation allowance | (18,437) | (13,333)
Total deferred tax assets, net of valuation allowances | 2,915 | 1,072
Components of the deferred income tax liability |  |
Depreciation | (2,778) | (633)
Foreign subsidiaries unremitted earnings | (1,750) | (412)
Prepaid | (69) | (88)
Total deferred tax liabilities | (4,597) | (1,133)
Deferred tax liabilities, net | (1,682) | (61)
Balance sheet classification |  |
Deferred tax assets - long-term | 147 | 99
Deferred tax liabilities - long-term | (1,829) | $ (160)
Middle East [Member] |  |
Components of deferred income tax assets |  |
Foreign tax credit | $ 100 |

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