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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Income Taxes (Textual) [Abstract]      
Applying the statutory federal income tax rate to income before income taxes 35.00% 34.00%  
Future tax liabilities and expire Date 2024    
Change in the valuation allowance $ 49,000    
Recognized tax benefits excluding interest and penalties 941,000 780,000 727,000
Decrease the effective tax rate 580,000    
Company recognized potential interest and penalties 105,000 33,000  
Company had accrued potential interest and penalties 348,000 453,000  
Undistributed Earnings of Foreign Subsidiaries 3,143,000    
Research [Member]
      
Tax Credit Carryforward [Line Items]      
State research and development credit carryforwards 349,000    
State and Local Jurisdiction [Member]
      
Operating Loss Carryforwards [Line Items]      
State net operating loss carryforwards $ 131,000