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Export Sales and Major Customers (Details 1)
 3 Months Ended 9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Summary of percentage sales to major customer        
Percentage of purchases from major vendors 63.00%us-gaap_ConcentrationRiskPercentage1 76.00%us-gaap_ConcentrationRiskPercentage1 28.00%us-gaap_ConcentrationRiskPercentage1 46.00%us-gaap_ConcentrationRiskPercentage1
Raytheon Company [Member]        
Summary of percentage sales to major customer        
Percentage of purchases from major vendors 48.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= sodi_RaytheonCompanyMember		 67.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= sodi_RaytheonCompanyMember		    
United States Government [Member]        
Summary of percentage sales to major customer        
Percentage of purchases from major vendors 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= sodi_UnitedStatesGovernmentMember		      
BAE Systems Australia [Member]        
Summary of percentage sales to major customer        
Percentage of purchases from major vendors   9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= sodi_BaeSystemsAustraliaMember