SUBSEQUENT EVENTS (Details) (Subsequent Event [Member], USD $)	6 Months Ended
Jul. 31, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Merger consideration (in dollars per share)	$ 23.00
Merger termination fee	$ 11,000,000
Merger reverse termination fee	$ 19,000,000

Merger consideration in terms of each outstanding share of Company common stock converted into the right to receive a specified amount in cash as a result of the merger.

No definition available.

Name:	ntsc_MergerConsideration
Namespace Prefix:	ntsc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration