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Consolidated Statements of Cash Flows (Parenthetical) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Statement of Cash Flows [Abstract] |
Write off of related party receivable | $ 28,340

X
- Definition Write off of related party receivable. + References No definition available. + Details
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Namespace Prefix: | GRNQ_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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