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DISCONTINUED OPERATIONS. (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 29, 2014
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
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        
Net loss   (1,654,459)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (4,772,386)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (576,507)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Shuttle Bus Division        
Discontinued operations        
Products sales expressed as a percentage of consolidated sales     13.00%sts_PercentageOfConsolidatedSales
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
 
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
35,467,332us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
47,029,249us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
Pretax loss from Operations   (2,306,655)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
(7,836,430)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
(951,331)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
Net loss   $ (1,567,423)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
$ (4,772,386)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember
$ (576,507)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sts_ShuttleBusDivisionMember