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Principal Components of Net Deferred Tax Liability (Detail) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Deferred tax assets:    
Deferred revenue $ 297,000us-gaap_DeferredTaxAssetsDeferredIncome $ 1,255,000us-gaap_DeferredTaxAssetsDeferredIncome
Restricted stock 756,000dwsn_DeferredTaxAssetsTaxRestrictedStock 390,000dwsn_DeferredTaxAssetsTaxRestrictedStock
Workers' compensation 148,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 224,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
State tax net operating loss (NOL) carry forward 792,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 802,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Federal tax NOL carry forward 11,205,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 9,012,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Foreign tax NOL carry forward 2,441,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 952,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Self-insurance 286,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 286,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Canadian start-up costs 337,000dwsn_DeferredTaxAssetsCanadianStartUpCosts 405,000dwsn_DeferredTaxAssetsCanadianStartUpCosts
AMT credit carry forward 312,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 310,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Other 565,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards 166,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
Total gross deferred tax assets 17,139,000us-gaap_DeferredTaxAssetsGross 13,802,000us-gaap_DeferredTaxAssetsGross
Less valuation allowance (2,771,000)us-gaap_DeferredTaxAssetsValuationAllowance (1,265,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax assets 14,368,000us-gaap_DeferredTaxAssetsNet 12,537,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property and equipment (42,199,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (46,563,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (42,199,000)us-gaap_DeferredIncomeTaxLiabilities (46,563,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability (27,831,000)us-gaap_DeferredTaxLiabilities (34,026,000)us-gaap_DeferredTaxLiabilities
Current portion of net deferred tax asset/liability 5,977,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,664,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current portion of net deferred tax asset/liability (33,808,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (35,690,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax liability $ (27,831,000)us-gaap_DeferredTaxLiabilities $ (34,026,000)us-gaap_DeferredTaxLiabilities