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Other intangible assets with definite lives (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 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 $ 2,700,000   $ 2,700,000   $ 2,680,000
Accumulated amortization 2,310,000   2,310,000   $ 2,280,000
Amortization expense, next twelve months 26,800   26,800    
Amortization expense, year two 49,700   49,700    
Amortization expense, year three 46,700   46,700    
Amortization expense, year four 37,700   37,700    
Amortization expense, year five 34,700   34,700    
Amortization expense, thereafter 197,000   197,000    
Patent amortization expense $ 13,000 $ 13,000 $ 26,000 $ 26,000