v2.4.0.6

Note 2 - Summary of Significant Accounting Policies (Detail) - Schedule of property, plant, and equipment, estimated lives	6 Months Ended
	Jun. 30, 2012
Building [Member]
Useful life	5-20 years
Machinery and Equipment [Member]
Useful life	5-10 years
Automobiles [Member]
Vehicles	5 years
Office Equipment [Member]
Useful life	5-10 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, string type element.

+ References

No definition available.

+ Details

Name:	deer_PropertyPlantAndEquipmentUsefulLife1
Namespace Prefix:	deer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration