Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities (Details Textual)

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Investments in Marketable Securities (Details Textual)
 12 Months Ended
Jan. 31, 2013
USD ($)
Jan. 31, 2012
USD ($)
Jan. 31, 2011
USD ($)
Sep. 01, 2012
USD ($)
Sep. 01, 2012
EUR (€)
Sep. 01, 2009
USD ($)
Sep. 01, 2009
EUR (€)
Restricted cash $ 938,000 $ 1,200,000          
Acquisition-related consideration 5,656,000 [1] 12,255,000 [1]   2,200,000 [1] 1,700,000 [1] 1,000,000 [1] 800,000 [1]
Marketable Securities, Current 6,100,000 7,900,000          
Marketable Securities, Noncurrent 7,200,000 4,100,000          
Available-for-sale Securities 0 0 500,000        
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax $ 6,000 $ 100,000 $ 100,000        
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any earn-out that will be achieved based on expected future performance by the acquired entity, as well as the fair value of fixed purchase price.