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Dividends (Details)	May 01, 2018
Dividends
Common stock dividend declared, percentage of shares outstanding	5.00%
Stock dividend, number of shares granted for each share outstanding	0.05

X

- Definition

The percentage of common stock declared in a stock dividend, as a percentage of outstanding shares.

+ References

No definition available.

+ Details

Name:	dwsn_CommonStockDividendDeclaredStockDividendPercentageOfStockDeclared
Namespace Prefix:	dwsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the ratio of number of shares of stock issued in a stock dividend to each share outstanding.

+ References

No definition available.

+ Details

Name:	dwsn_StockDividendRatio
Namespace Prefix:	dwsn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DividendsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration