XML 31 R17.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Advertising Costs | 12 Months Ended
--- | ---
Dec. 31, 2018
Advertising Costs |
Advertising Costs | 11. Advertising Costs Advertising costs are charged to expense as incurred. Advertising costs for the years ended December 31, 2018, 2017 and 2016 totaled $498,000, $371,000, and $372,000, respectively.

X
- Definition The entire disclosure for reporting the Company's advertising expenses. + References No definition available. + Details
Name: | dwsn_AdvertisingExpenseTextBlock
Namespace Prefix: | dwsn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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