Organization and Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Lease period	one year or less
Services pursuant to contracts term	12 months
Support services term	12 months
Additional charges	$ 0
Contracts receivable term	less than two years
Liquid investments maturity period	three months or less
Salvage value assigned to property and equipment	0
Impairment charges related to long-lived assets	0	0	0
Customers warranty against defects	3 months
Warranty expense amounted to approximately	$ 61,000	$ 3,000	$ 70,000
Anti-dilutive weighted shares of potential common stock	296,000	339,000	726,000
Covenants Not To Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Amortization Period	3 years
Building [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	30 years
Property Improvements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Short-term investments maturity period	12 months
Estimated useful lives	7 years
Maximum [Member] | Proprietary rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Amortization Period	15 years
Maximum [Member] | Channel Boxes [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years
Maximum [Member] | Peripheral Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Short-term investments maturity period	3 months
Estimated useful lives	3 years
Minimum [Member] | Proprietary rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Amortization Period	12 years 6 months
Minimum [Member] | Channel Boxes [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Minimum [Member] | Peripheral Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	2 years