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Income taxes Components of deferred income tax (Tables) | 12 Months Ended
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Jan. 31, 2017
Components of deferred income tax [Line Items] |
Components of deferred tax assets and liabilities [Table Text Block] |
Components of deferred income tax assets | 2016 |  | 2015 |
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 liability, net | ($1,682) | ($61)
Balance sheet classification |  |
Long-term assets | $147 | $99
Long-term liability | (1,829 | ) | (160 | )
Total deferred tax liabilities, net of valuation allowances | ($1,682) | ($61)

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- Definition [Line Items] for Components of deferred income tax [Table] + References No definition available. + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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