v2.4.0.6

Note 2 - Summary of Significant Accounting Policies (Detail) - Schedule of property, plant, and equipment, estimated lives | 6 Months Ended
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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