Name:	cga_ActualTaxExpensesPercentage
Namespace Prefix:	cga_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to expected income tax expense (benefit).

No definition available.

Name:	cga_EffectiveIncomeTaxRateReconciliationExpectedIncomeTaxExpenseBenefit
Namespace Prefix:	cga_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to high-tech income benefits.

No definition available.

Name:	cga_EffectiveIncomeTaxRateReconciliationHighTechIncomeBenefits
Namespace Prefix:	cga_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

No definition available.

Name:	cga_EffectiveIncomeTaxRateReconciliationUnrecognizedEquityInEarningsLossesOfSubsidiary
Namespace Prefix:	cga_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to High-tech income benefits.

No definition available.

Name:	cga_IncomeTaxReconciliationChangeInEnactedTaxRateIncomeTaxReconciliationHighTechIncomeBenefits
Namespace Prefix:	cga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	cga_IncomeTaxReconciliationExpectedIncomeTaxExpenseBenefit
Namespace Prefix:	cga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Pretax income (loss).

No definition available.

Name:	cga_IncomeTaxReconciliationPretaxIncomeloss
Namespace Prefix:	cga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

No definition available.

Name:	cga_IncomeTaxReconciliationUnrecognizedEquityInEarningsLossesOfSubsidiary
Namespace Prefix:	cga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

Name:	cga_TaxesPayableDetailsScheduleofeffectiveincometaxratereconciliationLineItems
Namespace Prefix:	cga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(1)(Note 1))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.2)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Name:	us-gaap_CurrentIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319