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Income taxes Income tax disclosure (Details) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Components of deferred income tax assets [Line Items] |  |  |
Tax benefit of stock options exercised |  | $ 11,000 | $ 0
Excess tax (benefit) expense from stock options exercised |  | 11,000 | (6,000)
Change in deferred tax assets valuation allowance | 3,000,000 | 12,500,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  | 3,680,000 | 3,728,000
Non-qualified deferred compensation |  | 2,092,000 | 1,968,000
Federal operating loss carryforward expires |  | Jan. 31, 2030 |
Research tax credit |  | 1,964,000 | 1,858,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 1,066,000 | 921,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits |  | 837,000 | 691,000
Accrued pension |  | 428,000 | 578,000
Inventory valuation allowance |  | 306,000 | 300,000
Other |  | 94,000 | 225,000
Inventory uniform capitalization |  | 132,000 | 128,000
Deferred tax assets, gross |  | 16,631,000 | 16,899,000
Valuation allowance |  | (14,180,000) | (1,934,000)
Total deferred tax assets, net of valuation allowances |  | 2,451,000 | 14,965,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss) |  | 2,680,000 | 3,189,000
Depreciation |  | 1,041,000 | 1,733,000
Prepaid |  | 340,000 | 319,000
Total deferred tax liabilities |  | 1,381,000 | 2,052,000
Deferred income tax, net |  | 1,070,000 | 12,913,000
Deferred tax assets - current |  | 0 | 1,946,000
Deferred tax assets - long-term |  | 1,766,000 | 10,967,000
Deferred tax liabilities - current |  | 696,000 | 0
Operating Loss Carryforwards, Expiration Dates |  | expire at various times from 2013 to 2031 |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 14,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 1,297,000 | 1,300,000
Foreign NOL carryforward |  | 2,241,000 | 2,726,000
Stock compensation |  | 1,417,000 | 1,243,000
Other accruals not yet deducted |  | 1,077,000 | 1,233,000
Current Fiscal Year End Date |  | --01-31 |
Foreign tax credit |  | (67,000) | (1,300,000)
Tax Credit Carryforward, Expiration Date |  |  | Jan. 31, 2022
Undistributed earnings of foreign subsidiaries |  | 17,000,000 |
Open Tax Year |  | 2010 |
Open tax years up to the amount of research tax credit generated |  | January 31, 2002 through January 31, 2009 |
Additional Paid-in Capital |  |  |
Components of deferred income tax assets [Line Items] |  |  |
Excess tax (benefit) expense from stock options exercised |  | 11,000 | (6,000)
DENMARK |  |  |
Components of deferred income tax assets [Line Items] |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 1,000,000 |
Middle East [Member] |  |  |
Components of deferred income tax assets [Line Items] |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 1,200,000 |
Domestic Tax Authority [Member] |  |  |
Components of deferred income tax assets [Line Items] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  | $ 12,400,000 |

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