XML 23 R31.htm IDEA: XBRL DOCUMENT v3.3.0.814
Other intangible assets with definite lives (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 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 $ 2,730,000   $ 2,730,000   $ 2,680,000
Accumulated amortization 2,320,000   2,320,000   $ 2,280,000
Amortization expense, next twelve months 13,950   13,950    
Amortization expense, year two 51,950   51,950    
Amortization expense, year three 48,900   48,900    
Amortization expense, year four 39,950   39,950    
Amortization expense, year five 36,950   36,950    
Amortization expense, thereafter 214,700   214,700    
Patent amortization expense $ 14,000 $ 13,000 $ 40,000 $ 38,000