XML 51 R26.htm IDEA: XBRL DOCUMENT v2.4.0.6

Concentration of Credit Risk (Details)	Sep. 30, 2012
Concentration Risk [Line Items]
Number of Months of Potential Revenue Loss	2 months

X

- Definition

Number of months of potential revenue loss.

+ References

No definition available.

+ Details

Name:	mcf_NumberOfMonthsOfPotentialRevenueLoss
Namespace Prefix:	mcf_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

X

- Details

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