CONVERTIBLE NOTES PAYABLE ON VARIOUS DATES (Details) (USD $)	Dec. 31, 2012	Mar. 31, 2012
Convertible notes issued On November 16, 2011	$ 0	$ 250,000
Convertible notes issued On January 16, 2012	0	250,000
Convertible notes issued On March 7, 2012	200,000	200,000
Convertible notes issued On May 30, 2012	200,000	0
Total of convertible notes on various dates	$ 400,000	$ 700,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

No definition available.

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Namespace Prefix:	stev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant