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Income taxes Income taxes (Details) (USD $)
 3 Months Ended
Apr. 30, 2015
Rate
Apr. 30, 2014
Rate
Income tax [Abstract]    
effective income tax rate from continuing operations (0.60%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 23.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized tax benefits $ 100,000us-gaap_UnrecognizedTaxBenefits  
Unrecognized tax benefits that would impact effective tax rate 100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized tax benefits, income tax penalties and interest expense 2,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Unrecognized tax benefits, income tax penalties and interest accrued $ 40,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Open tax year beginning 2012  
Open tax years up to the amount of research tax credit generated January 31, 2002 through January 31, 2012  
Operating loss carryforwards, expiration dates beginning Jan. 31, 2030