v3.5.0.2

Note 12 - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Inputs, Level 1 [Member]
Fuel derivatives
Fair Value, Inputs, Level 2 [Member]
Fuel derivatives	(95)
Fair Value, Inputs, Level 3 [Member]
Fuel derivatives
Fuel derivatives	$ (95)

X

- Definition

Fair value portion of asset contracts related to fuel derivatives.

+ References

No definition available.

+ Details

Name:	cgi_FuelDerivativesContractAssetFairValueDisclosure
Namespace Prefix:	cgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: