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DISCONTINUED OPERATIONS (Details) (USD $)
3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Discontinued operations    
Net proceeds from sale of assets $ 3,884,656us-gaap_ProceedsFromDivestitureOfBusinesses  
Gain on sale of business, net of tax 87,036us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Operating results    
Loss after income taxes (1,567,423)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity  
Shuttle Bus Division    
Discontinued operations    
Net proceeds from sale of assets 3,900,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Inventory 4,100,000us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Machinery and equipment. 200,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Reduction in proceeds due to warranty obligation 500,000sts_DisposalGroupIncludingDiscontinuedOperationContingentLiabilities
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Gain on sale of business, net of tax 100,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Period for which the entity will not compete under asset purchase agreement 5 years  
Operating results    
Net sales 6,549,209us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Loss before income taxes (2,306,655)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Loss after income taxes $ (1,567,423)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
Shuttle Bus Division | Maximum    
Discontinued operations    
Products sales expressed as a percentage of consolidated sales   13.00%sts_PercentageOfConsolidatedSales
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember