Note 1 - Basis of Presentation (Details Textual)	3 Months Ended
Mar. 31, 2019
Number of Wholly Owned Subsidiaries	3

Represents the number of wholly owned subsidiaries.

No definition available.

Name:	dcph_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix:	dcph_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration