Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015
Level I [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 79	$ 87
Long-term investments	2,498	2,619
Total investments	2,577	2,706
Level II [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Long-term investments	0	0
Total investments	0	0
Level III [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Long-term investments	0	0
Total investments	$ 0	$ 0