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Warrants (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2020
Warrants and Rights Note Disclosure [Abstract]
Number of warrants exercisable into common shares	53,556
Exercise price of warrants	$ 7.20
Warrant expiration date	Expire in 2023
Intrinsic value of outstanding warrant

X

- Definition

Number of warrants exercisable into common shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	GRNQ_
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X

- Definition

Share based compensation arrangement by share based payment Award non-option equity instruments intrinsic value.

+ References

No definition available.

+ Details

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Namespace Prefix:	GRNQ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Warrant expiration date.

+ References

No definition available.

+ Details

Name:	GRNQ_WarrantExpirationDate
Namespace Prefix:	GRNQ_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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- References

No definition available.

+ Details

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