XML 33 R22.htm IDEA: XBRL DOCUMENT
v3.20.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) item | Dec. 31, 2019 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Allowance for doubtful accounts | $ | $ 250,000 | $ 250,000
Number of notes receivable | item | 1 |
Maximum original expected duration of cancelable service contracts | 1 year |

X
- Definition Maximum original expected duration of cancelable service contracts with customers. + References No definition available. + Details
Name: | dwsn_CancelableServiceContractsMaximumOriginalExpectedDuration
Namespace Prefix: | dwsn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of notes receivable held by the company. + References No definition available. + Details
Name: | dwsn_NumberOfNotesReceivable
Namespace Prefix: | dwsn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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=6877327&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=118936363&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=118955202&loc=SL82895884-210446 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration