XML 58 R44.htm IDEA: XBRL DOCUMENT
v3.20.4

Debt - Maturities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Aggregate maturities of finance leases |  |
January 2021 - December 2021 | $ 54,000 |
January 2022 - December 2022 | 36,000 |
January 2023 - December 2023 | 8,000 |
Obligations under finance leases | $ 98,000 | $ 2,412,000
Minimum |  |
Aggregate maturities of finance leases |  |
Interest rate on leases | 4.83% |
Maximum |  |
Aggregate maturities of finance leases |  |
Interest rate on leases | 5.37% |

X
- Definition Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
Name: | dwsn_FinanceLeaseLiabilityNetOfImputedInterestPaymentsDueInNextRollingTwelveMonths
Namespace Prefix: | dwsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling year three following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
Name: | dwsn_FinanceLeaseLiabilityNetOfImputedInterestPaymentsDueInRollingYearThree
Namespace Prefix: | dwsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's discounted obligation for lease payments for finance lease, due in rolling year two following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
Name: | dwsn_FinanceLeaseLiabilityNetOfImputedInterestPaymentsDueInRollingYearTwo
Namespace Prefix: | dwsn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Discount rate used by lessee to determine present value of finance lease payments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeFinanceLeaseDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |