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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flow from Operating Activities    
Net income / (loss) $ 420us-gaap_ProfitLoss $ (30)us-gaap_ProfitLoss
Adjustments to reconcile net income / (loss) to net cash flow provided by operating activities    
Depreciation and amortization 1,742us-gaap_DepreciationDepletionAndAmortization 1,798us-gaap_DepreciationDepletionAndAmortization
Bad debt expense, net 50us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsProvisionChargedToExpense1 362us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsProvisionChargedToExpense1
Inventory recovery (77)us-gaap_InventoryWriteDown (63)us-gaap_InventoryWriteDown
Warranty expense, net 77us-gaap_ProductWarrantyExpense   
Accrued interest expense, net of interest income 27us-gaap_InterestExpenseOther 123us-gaap_InterestExpenseOther
Loss on sale of property - continued operations 28us-gaap_GainLossOnSaleOfProperty 56us-gaap_GainLossOnSaleOfProperty
Impairment loss 70us-gaap_GoodwillImpairmentLoss   
Contribution to capital - payable forgiveness 9us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt   
Stock option expenses 97us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 208us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Deferred tax provision (3)us-gaap_DeferredIncomeTaxExpenseBenefit (31)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities, net of acquisition effects    
Accounts receivables 244us-gaap_IncreaseDecreaseInAccountsReceivable 517us-gaap_IncreaseDecreaseInAccountsReceivable
Other receivables 27us-gaap_IncreaseDecreaseInOtherReceivables 1,360us-gaap_IncreaseDecreaseInOtherReceivables
Other assets 42us-gaap_IncreaseDecreaseInOtherOperatingAssets (1,225)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Inventories (307)us-gaap_IncreaseDecreaseInInventories 707us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (96)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 64us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities 13us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (467)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Income taxes payable 29us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (251)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other non-current liabilities    26us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net Cash Provided by Operating Activities 2,392us-gaap_NetCashProvidedByUsedInOperatingActivities 3,154us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flow from Investing Activities    
Proceeds from maturing of restricted & un-restricted deposits 636us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks   
Additions to property, plant and equipment (1,460)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,297)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of plant, property and equipment 15us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 31us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net Cash Used in Investing Activities (809)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,266)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flow from Financing Activities    
Repayment of lines of credit (1,644)us-gaap_RepaymentsOfLinesOfCredit (1,018)us-gaap_RepaymentsOfLinesOfCredit
Repayment of bank loans and capital leases (570)TRT_RepaymentOfBankLoansAndCapitalLeases (795)TRT_RepaymentOfBankLoansAndCapitalLeases
Proceeds from long-term bank loans 260TRT_ProceedsFromLongtermBankLoans 525TRT_ProceedsFromLongtermBankLoans
Proceeds from exercising stock options    351us-gaap_ProceedsFromStockOptionsExercised
Dividend paid to non-controlling interest (3)us-gaap_PaymentsOfDividends (82)us-gaap_PaymentsOfDividends
Net Cash Used in Financing Activities (1,957)us-gaap_NetCashProvidedByUsedInFinancingActivities (1,019)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of Changes in Exchange Rate (191)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (113)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET DECREASE IN CASH AND CASH EQUIVALENTS (565)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (244)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2,938us-gaap_CashAndCashEquivalentsAtCarryingValue 2,793us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, END OF PERIOD 2,373us-gaap_CashAndCashEquivalentsAtCarryingValue 2,549us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplementary Information of Cash Flows    
Cash paid during the period for Interest 177us-gaap_InterestPaidNet 196us-gaap_InterestPaidNet
Cash paid during the period for Income taxes 8us-gaap_IncomeTaxesPaidNet 16us-gaap_IncomeTaxesPaidNet
Non-Cash Transactions    
Capital leases of property, plant and equipment $ 260us-gaap_AmortizationOfLeasedAsset $ 67us-gaap_AmortizationOfLeasedAsset