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Commitments and Contingencies (Details Textual) (USD $)
1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Nov. 30, 2013
Feb. 28, 2015
Feb. 28, 2014
Dec. 05, 2014
Jan. 14, 2014
Dec. 31, 2000
May 22, 2013
Feb. 14, 2013
Mar. 27, 2013
Oct. 01, 2014
sqft
Commitments and Contingencies (Textual)                    
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare              
Payment under settlement agreement $ 125,000us-gaap_PaymentsForEnvironmentalLiabilities                  
Rent expenses   370,000us-gaap_LeaseAndRentalExpense 394,000us-gaap_LeaseAndRentalExpense              
Employment Agreement [Member] | Mr. Saraf [Member]                    
Commitments and Contingencies (Textual)                    
Term of agreement           5 years        
Annual compensation       321,500us-gaap_OfficersCompensation
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
296,500us-gaap_OfficersCompensation
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
240,000us-gaap_OfficersCompensation
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
       
Percentage of bonus, description           Bonus equal to fifteen percent (15%) of the Company's pre-tax income in excess of Two Hundred Fifty Thousand Dollars ($250,000).        
Term of bonus payable           90 days        
Accrued bonus   105,000us-gaap_AccruedBonusesCurrent
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
               
Notice period of employment agreement   180 days                
Percentage of outstanding shares available for options   10.00%sodi_PercentageOfOutstandingSharesGrant
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
               
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
               
Exercise price of option   $ 0.40sodi_OptionExercisePrice
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
               
Percentage of options granted and vested immediately   50.00%sodi_OptionsGranted
/ us-gaap_OtherCommitmentsAxis
= sodi_EmploymentAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_PresidentMember
               
Options granted, description   Fifty percent (50%) of the Initial Stock Options granted were vested immediately upon grant. The remaining fifty percent (50%) of the Initial Stock Options vested in equal amounts on each of the first five anniversaries of the date of grant.                
ATP Settlement Agreement [Member]                    
Commitments and Contingencies (Textual)                    
Payment under settlement agreement             7,710us-gaap_PaymentsForEnvironmentalLiabilities
/ us-gaap_OtherCommitmentsAxis
= sodi_AtpSettlementAgreementMember
10,000us-gaap_PaymentsForEnvironmentalLiabilities
/ us-gaap_OtherCommitmentsAxis
= sodi_AtpSettlementAgreementMember
   
FDEP Settlement Agreement [Member]                    
Commitments and Contingencies (Textual)                    
Payment under settlement agreement                 165,000us-gaap_PaymentsForEnvironmentalLiabilities
/ us-gaap_OtherCommitmentsAxis
= sodi_FdepSettlementAgreementMember
 
Operating Leases [Member]                    
Commitments and Contingencies (Textual)                    
Area of leased space (In square foot)                   47,000sodi_AreaOfLeasedSpace
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Base rent per month                   $ 34,451sodi_OperatingLeaseBaseRent
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Operating lease expiration date                   Dec. 31, 2021
Period over which lease agreement can be extended                   5 years
Operating leases description                   The Company has the option to extend the term of the Lease for an additional five years beginning on January 1, 2022 and ending on December 31, 2026.