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Major Suppliers (Details) (Purchases [Member])
12 Months Ended
Feb. 28, 2015
Suppliers
Feb. 28, 2014
Suppliers
Purchases [Member]
   
Major Suppliers (Textual)    
Purchases from major suppliers 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
43.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
Number of major suppliers 2sodi_NumberOfMajorSuppliers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember
2sodi_NumberOfMajorSuppliers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsTotalMember