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

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

No definition available.

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