Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Deferred tax assets:
Net operating losses	$ 1,246	$ 146
Tax credit carry forwards	3,449	803
Stock option book expense	2,605	2,533
Allowance for doubtful accounts	1,752	1,645
Allowance for inventory obsolescence	192	192
Accruals not yet deductible for tax purposes	692	1,115
Other	675	1,531
Gross deferred tax assets	10,611	7,965
Valuation allowance
Deferred tax assets	10,611	7,965
Deferred tax liabilities:
Fixed assets	(1,841)	(3,617)
Intangible assets	(595)	(774)
Foreign branch taxes	(1,626)	(1,575)
Other	(411)
Deferred tax liabilities	(4,473)	(5,966)
Total deferred tax assets, net	$ 6,138	$ 1,999