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Income taxes Components of deferred income tax (Tables) | 12 Months Ended
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Jan. 31, 2018
Components of deferred income tax [Line Items] |
Components of deferred tax assets and liabilities [Table Text Block] |
Components of deferred income tax assets (in thousands) | 2017 |  | 2016 |
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 liability, net | ($851) | ($1,682)
Balance sheet classification |  |
Long-term assets | $391 | $147
Long-term liability | (1,242 | ) | (1,829 | )
Total deferred tax liabilities, net of valuation allowances | ($851) | ($1,682)

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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=84230637&loc=d3e32537-109319 + Details
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