Basis of Presentation and Summary of Significant Accounting Policies (Details 2)	9 Months Ended
Mar. 31, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Risk-free rate	2.96%
Volatility	51.40%
Dividend yield	0.00%
Country risk premium	90.00%
Liquidity risk premium	3.00%

Fair value assumptions country risk premium.

No definition available.

Name:	cga_FairValueAssumptionsCountryRiskPremium
Namespace Prefix:	cga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value assumptions liquidity risk premium.

+ References

No definition available.

+ Details

Name:	cga_FairValueAssumptionsLiquidityRiskPremium
Namespace Prefix:	cga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration