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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Threshold period of past due (in days)	90 days
Allowance for doubtful accounts	$ 250,000	$ 250,000
Maximum original expected duration of cancelable service contracts (in years)	1 year

X

- Definition

Maximum original expected duration of cancelable service contracts with customers.

+ References

No definition available.

+ Details

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X

- Definition

Threshold period past due for trade accounts receivable to be evaluated by the management for the need of allowance for doubtful accounts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	dwsn_ThresholdPeriodPastDueForAllowanceForDoubtfulAccountsEvaluationOfTradeAccountsReceivable
Namespace Prefix:	dwsn_
Data Type:	xbrli:durationItemType
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Period Type:	duration

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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