Revenue Recognition (Remaining Performance Obligations and Practical Expedients) (Details)	3 Months Ended
Mar. 31, 2018
Revenue Recognition
Practical expedient, incremental cost of obtaining contract	True
Optional exemption, performance obligation	True
Practical expedient, Financing component	True

Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed.

No definition available.

Name:	plow_RevenueRemainingPerformanceObligationOptionalExemptionPerformanceObligation
Namespace Prefix:	plow_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration