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Note 12 - Income Taxes and Other Taxes Payable (Detail) - Schedule of the Effects of Tax Exemption (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Aggregate dollar effect of tax exemption (in Dollars) | $ 1,397,866 | $ 1,504,950
Basic EPS impact | $ 0.07 | $ 0.10

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- Definition Per share amount effect of a income tax exemption on basic earnings per share. + References No definition available. + Details
Name: | stvs_ImpactOfIncomeTaxExemptionOnEarningsPerShareBasic
Namespace Prefix: | stvs_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to income that is exempt from income taxes under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
Name: | us-gaap_IncomeTaxReconciliationTaxExemptIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration