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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Cash flows from operating activities:    
Net earnings $ 3,006us-gaap_ProfitLoss $ 2,988us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,900us-gaap_Depreciation 1,846us-gaap_Depreciation
Bad debt provision 34us-gaap_ProvisionForDoubtfulAccounts 109us-gaap_ProvisionForDoubtfulAccounts
Stock based compensation expense 154us-gaap_AllocatedShareBasedCompensationExpense 186us-gaap_AllocatedShareBasedCompensationExpense
Provision for deferred income tax expense (71)us-gaap_DeferredIncomeTaxExpenseBenefit (80)us-gaap_DeferredIncomeTaxExpenseBenefit
Change in assets and liabilities:    
(Increase) decrease in receivables (1,623)us-gaap_IncreaseDecreaseInAccountsReceivable 3,805us-gaap_IncreaseDecreaseInAccountsReceivable
(Increase) decrease in inventories (492)us-gaap_IncreaseDecreaseInInventories 696us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in accounts payable and other accrued expenses 4,022us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (2,127)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Increase (decrease) in deferred revenue 159us-gaap_IncreaseDecreaseInDeferredRevenue (317)us-gaap_IncreaseDecreaseInDeferredRevenue
Other, net (750)us-gaap_OtherOperatingActivitiesCashFlowStatement 126us-gaap_OtherOperatingActivitiesCashFlowStatement
Net cash provided by operating activities 6,339us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 7,232us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Capital expenditures (2,135)us-gaap_PaymentsToAcquireProductiveAssets (1,614)us-gaap_PaymentsToAcquireProductiveAssets
(Increase) decrease in restricted cash (2,156)us-gaap_IncreaseDecreaseInRestrictedCash 14us-gaap_IncreaseDecreaseInRestrictedCash
Net cash used in investing activities (4,291)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,600)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Dividends paid (919)us-gaap_PaymentsOfDividends (834)us-gaap_PaymentsOfDividends
Dividends paid to noncontrolling interest in subsidiaries (38)us-gaap_PaymentsOfDividendsMinorityInterest (38)us-gaap_PaymentsOfDividendsMinorityInterest
Decrease in short-term borrowings and interest rate swap (2,114)kequ_IncreaseDecreaseInShortTermBorrowingsAndInterestRateSwap (2,828)kequ_IncreaseDecreaseInShortTermBorrowingsAndInterestRateSwap
Proceeds from long-term debt   5,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments on long-term debt (316)us-gaap_RepaymentsOfLongTermDebt (3,748)us-gaap_RepaymentsOfLongTermDebt
Payment toward purchase of noncontrolling interest in subsidiary (888)us-gaap_PaymentsToMinorityShareholders (1,780)us-gaap_PaymentsToMinorityShareholders
Net proceeds from exercise of stock options (including tax benefit) 33kequ_NetProceedsFromExerciseOfStockOptionsIncludingTaxBenefit 59kequ_NetProceedsFromExerciseOfStockOptionsIncludingTaxBenefit
Net cash used in financing activities (4,242)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (4,169)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (191)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (616)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
(Decrease) increase in cash and cash equivalents (2,385)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 847us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 6,248us-gaap_CashAndCashEquivalentsAtCarryingValue 5,811us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 3,863us-gaap_CashAndCashEquivalentsAtCarryingValue 6,658us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information    
Purchase of noncontrolling interest in subsidiary - Other accrued expenses and other non-current liabilities   $ 1,775us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1