v2.4.0.6

Note 2 - Summary of Significant Accounting Policies (Detail) - Schedule of`land-use rights (Parentheticals) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 USD ($) | Jun. 30, 2012 CNY | Jun. 30, 2012 Site use right Phase I [Member] USD ($) | Jun. 30, 2012 Site use right Phase II [Member] USD ($) | Jun. 30, 2012 Land use rights, first parcel [Member] USD ($) | Jun. 30, 2012 Land use rights, first parcel [Member] CNY | Jun. 30, 2012 Land use rights, second parcel [Member] USD ($) | Jun. 30, 2012 Land use rights, second parcel [Member] CNY
Price in USD | $ 34.50 | 4.95 | $ 0.30 | $ 0.60 | $ 22.70 | 149.00 | $ 11.80 | 77.37

X
- Definition Value of land use rights purchased. + References No definition available. + Details
Name: | deer_LandUseRightsValue
Namespace Prefix: | deer_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration