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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
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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
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Data Type:	dtr:percentItemType
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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.

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Data Type:	dtr:percentItemType
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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
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Data Type:	xbrli:monetaryItemType
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Pretax income (loss).

No definition available.

Name:	cga_IncomeTaxReconciliationPretaxIncomeloss
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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
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Data Type:	xbrli:stringItemType
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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(1)(Note 1))
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
-Section S99
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Publisher FASB
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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
-Topic 740
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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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.

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Amount of other income tax expense (benefit).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Topic 740
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-9