Capital Lease - Related Party (Detail Textuals) (Related party, USD $)	0 Months Ended
Nov. 03, 2009
Related party
Related Party Transaction [Line Items]
Capital lease, monthly rental payments	$ 7,500
Capital lease, imputed fixed interest rate	2.00%

This element represent capital lease transaction monthly rental payments to related party, interest rate.

No definition available.

Name:	svt_CapitalLeaseTransactionMonthlyRentalPaymentsToRelatedPartyInterestRate
Namespace Prefix:	svt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration