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Subsequent Events (Details Narrative) - Subsequent Event [Member] - Rito Group Corp [Member] - USD ($) |  | 1 Months Ended
--- | --- | ---
Apr. 13, 2018 | Mar. 31, 2018 | Feb. 28, 2018
Number of common shares hold | 100,000 |  |
Stock Purchase Agreements [Member] |  |  |
Number of common stock shares sold |  | 14,900,000 | 14,900,000
Number of common stock shares sold, consideration |  | $ 300,000 | $ 300,000
Gain on investments |  | $ 300,000 | $ 300,000

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- Definition Number of common shares hold. + References No definition available. + Details
Name: | GRNQ_NumberOfCommonSharesHold
Namespace Prefix: | GRNQ_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=GRNQ_RitoGroupCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=GRNQ_StockPurchaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |