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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 672us-gaap_ComprehensiveIncomeNetOfTax $ 782us-gaap_ComprehensiveIncomeNetOfTax
Adjustments to reconcile net income to net cash provided by and (used in) operating activities:    
Depreciation and amortization 168us-gaap_DepreciationDepletionAndAmortization 175us-gaap_DepreciationDepletionAndAmortization
Decrease (increase) in operating assets:    
Accounts receivable 105us-gaap_IncreaseDecreaseInAccountsReceivable 381us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (178)us-gaap_IncreaseDecreaseInInventories (483)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 1us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (18)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (1)us-gaap_IncreaseDecreaseInOtherOperatingAssets 23us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in operating liabilities:    
Accounts payable - Post-petition 91us-gaap_IncreaseDecreaseInAccountsPayable (83)us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable - Pre-petition (8)sodi_IncreaseDecreaseInAccountsPayablePrePetition (274)sodi_IncreaseDecreaseInAccountsPayablePrePetition
Customer deposits 1us-gaap_IncreaseDecreaseInCustomerDeposits (75)us-gaap_IncreaseDecreaseInCustomerDeposits
Accrued expenses (85)us-gaap_IncreaseDecreaseInAccruedLiabilities (132)us-gaap_IncreaseDecreaseInAccruedLiabilities
Long-term liabilities      
Total adjustments 94us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (486)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
NET CASH PROVIDED BY OPERATING ACTIVITIES 766us-gaap_NetCashProvidedByUsedInOperatingActivities 296us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sales of Treasury Bills and Certificates of Deposit 4,769sodi_ProceedsFromSaleOfTreasuryBillsAndCertificatesDeposit 1,799sodi_ProceedsFromSaleOfTreasuryBillsAndCertificatesDeposit
Purchases of Treasury Bills and Certificates of Deposit (5,478)sodi_PaymentToAcquireTreasuryBillsAndCertificatesDeposit (2,831)sodi_PaymentToAcquireTreasuryBillsAndCertificatesDeposit
Purchases of property, plant and equipment (90)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (184)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
NET CASH (USED IN) INVESTING ACTIVITIES (799)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,216)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash from exercise of employee stock options 6us-gaap_ProceedsFromStockOptionsExercised   
Payment of Dividends (109)us-gaap_PaymentsOfDividends   
NET CASH (USED IN) FINANCING ACTIVITIES (103)us-gaap_NetCashProvidedByUsedInFinancingActivities   
Net (decrease) in cash and cash equivalents (136)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (920)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning of the period 625us-gaap_CashAndCashEquivalentsAtCarryingValue 1,297us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - end of the period $ 489us-gaap_CashAndCashEquivalentsAtCarryingValue $ 377us-gaap_CashAndCashEquivalentsAtCarryingValue