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Business Combinations - Schedule of Proforma Information of Operation (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Business Combinations [Abstract]
Revenue	$ 2,117,169	$ 1,301,629
Gross profit	1,540,521	677
Operating income (loss)	117,784	(244,072)
Net income (loss)	$ 106,815	$ (304,939)
Net income (loss) per share	$ 0.00	$ (0.00)

X

- Definition

Net income (loss) per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	GRNQ_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gross profit.

+ References

No definition available.

+ Details

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Namespace Prefix:	GRNQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Operating income (loss).

+ References

No definition available.

+ Details

Name:	GRNQ_BusinessAcquisitionsProFormaOperatingIncomeLoss
Namespace Prefix:	GRNQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- References

No definition available.

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