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DEBT (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Debt Instruments          
Notes Payable $ 12,521,762us-gaap_NotesPayable $ 14,917,991us-gaap_NotesPayable      
Less current maturities (7,296,950)us-gaap_NotesPayableCurrent (8,434,879)us-gaap_NotesPayableCurrent      
Notes payable, Noncurrent 5,224,812us-gaap_LongTermNotesPayable 6,483,112us-gaap_LongTermNotesPayable      
Repayments of Notes Payable 11,657,862us-gaap_RepaymentsOfNotesPayable 13,342,462us-gaap_RepaymentsOfNotesPayable 11,338,097us-gaap_RepaymentsOfNotesPayable    
Annual maturities of notes payable          
2015 7,296,950us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths        
2016 3,572,428us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo        
2017 1,652,384us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree        
Total 12,521,762us-gaap_NotesPayable 14,917,991us-gaap_NotesPayable      
Less than          
Debt Instruments          
Debt instrument stated rate (as a percent) 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Revolving credit facility          
Debt Instruments          
Maximum borrowing capacity       5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Notes payable to commercial banks          
Debt Instruments          
Notes Payable 12,072,454us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
14,416,225us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
     
Annual maturities of notes payable          
Total 12,072,454us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
14,416,225us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
     
Notes payable with interest rate between 3.50% and 4.60%          
Debt Instruments          
Number of notes payable 4dwsn_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
4dwsn_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
     
Minimum interest rate (as a percent) 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
     
Maximum interest rate (as a percent) 4.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
4.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
     
Notes payable with interest rate between 3.50% and 4.60% | Minimum          
Debt Instruments          
Monthly principal installments 128,363us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
128,363us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Notes payable with interest rate between 3.50% and 4.60% | Less than          
Debt Instruments          
Monthly principal installments 215,863us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
215,863us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Notes Payable to finance companies for insurance notes          
Debt Instruments          
Notes Payable 449,308us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableToFinanceCompaniesForInsuranceNotesMember
501,766us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableToFinanceCompaniesForInsuranceNotesMember
     
Annual maturities of notes payable          
Total 449,308us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableToFinanceCompaniesForInsuranceNotesMember
501,766us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableToFinanceCompaniesForInsuranceNotesMember
     
Notes payable with interest rate between 4.09% and 4.95%          
Debt Instruments          
Number of notes payable 2dwsn_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
2dwsn_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
     
Minimum interest rate (as a percent) 4.09%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
4.09%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
     
Maximum interest rate (as a percent) 4.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
4.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
     
Notes payable with interest rate between 4.09% and 4.95% | Minimum          
Debt Instruments          
Monthly principal installments 14,674us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
14,674us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Notes payable with interest rate between 4.09% and 4.95% | Less than          
Debt Instruments          
Monthly principal installments $ 326,366us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 326,366us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= dwsn_NotesPayableWithInterestRateBetween4.09PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember