XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Short-Term Investments (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Minimum |  |
Maturity period of certificates of deposit | 3 months | 3 months
Maximum |  |
Maturity period of certificates of deposit | 1 year | 1 year

X
- Definition Remaining maturity of certificates of deposit, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
Name: | dwsn_CertificatesOfDepositMaturityPeriod
Namespace Prefix: | dwsn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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: |