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Investment Property | 3 Months Ended
--- | ---
Mar. 31, 2017
Property, Plant and Equipment [Abstract] |
Investment Property | NOTE 6 - INVESTMENT PROPERTY
|  | As of |  |  | As of |
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | (unaudited) |  |  |  |
Leasehold land and buildings for rental purpose |  | $ | 1,045,980 |  |  | $ | 1,044,213 |
Furniture and fixtures |  |  | 65,714 |  |  |  | 64,695 |
Office equipment |  |  | 12,730 |  |  |  | 12,263 |
Leasehold improvement |  |  | 89,171 |  |  |  | 87,920 |
|  |  | 1,213,595 |  |  |  | 1,209,091 |
Less: Accumulated depreciation |  |  | (202,965 | ) |  |  | (194,802 | )
Total |  | $ | 1,010,630 |  |  | $ | 1,014,289 |
Depreciation expense, classified as cost of rental, was $7,122 and $7,899 for the three months ended March 31, 2017 and 2016 respectively.

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- Definition Investment Property [Text Block] + References No definition available. + Details
Name: | GRNQ_InvestmentPropertyTextBlock
Namespace Prefix: | GRNQ_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration