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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 414us-gaap_ComprehensiveIncomeNetOfTax $ 431us-gaap_ComprehensiveIncomeNetOfTax
Adjustments to reconcile net income to net cash provided by and (used in) operating activities:    
Depreciation and amortization 113us-gaap_DepreciationDepletionAndAmortization 117us-gaap_DepreciationDepletionAndAmortization
Decrease (increase) in operating assets:    
Accounts receivable 400us-gaap_IncreaseDecreaseInAccountsReceivable 425us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net 164us-gaap_IncreaseDecreaseInInventories (236)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 14us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 17us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (3)us-gaap_IncreaseDecreaseInOtherOperatingAssets 6us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in operating liabilities:    
Accounts payable - Post-petition 78us-gaap_IncreaseDecreaseInAccountsPayable 50us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable - Pre-petition (8)sodi_IncreaseDecreaseInAccountsPayablePrePetition (198)sodi_IncreaseDecreaseInAccountsPayablePrePetition
Customer deposits 3us-gaap_IncreaseDecreaseInCustomerDeposits 25us-gaap_IncreaseDecreaseInCustomerDeposits
Accrued expenses (165)us-gaap_IncreaseDecreaseInAccruedLiabilities (253)us-gaap_IncreaseDecreaseInAccruedLiabilities
Total adjustments 268us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (47)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
NET CASH PROVIDED BY OPERATING ACTIVITIES 682us-gaap_NetCashProvidedByUsedInOperatingActivities 384us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sales of Treasury Bills and Certificates of Deposit 2,777sodi_ProceedsFromSaleOfTreasuryBillsAndCertificatesDeposit 2,340sodi_ProceedsFromSaleOfTreasuryBillsAndCertificatesDeposit
Purchases of Treasury Bills and Certificates of Deposit (3,236)sodi_PaymentToAcquireTreasuryBillsAndCertificatesDeposit (3,182)sodi_PaymentToAcquireTreasuryBillsAndCertificatesDeposit
Purchases of property, plant and equipment (47)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (128)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
NET CASH (USED IN) INVESTING ACTIVITIES (506)us-gaap_NetCashProvidedByUsedInInvestingActivities (970)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 increase/(decrease) in cash and cash equivalents 73us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (586)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 $ 698us-gaap_CashAndCashEquivalentsAtCarryingValue $ 711us-gaap_CashAndCashEquivalentsAtCarryingValue