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Other intangible assets with definite lives (Details) (USD $)
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Jan. 31, 2015
Other intangible assets with definite lives [Abstract]      
Finite-Lived Intangible Assets, Amortization Method Patents are capitalized and amortized on a straight-line basis over a period not to exceed the legal lives of the patents.    
Finite Lived Intangible Assets, Intent or Ability to Renew or Extend Arrangement The Company expenses costs incurred to renew or extend the term of intangible assets    
Gross patents $ 2,690,000us-gaap_FiniteLivedPatentsGross   $ 2,680,000us-gaap_FiniteLivedPatentsGross
Accumulated amortization 2,290,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   2,280,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortization expense, next twelve months 39,400us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Amortization expense, year two 49,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Amortization expense, year three 46,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Amortization expense, year four 37,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Amortization expense, year five 34,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Amortization expense, thereafter 191,715us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Patent amortization expense $ 13,000us-gaap_AmortizationOfIntangibleAssets $ 13,000us-gaap_AmortizationOfIntangibleAssets