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EQUITY Dividends (Details) (USD $)	3 Months Ended
	Dec. 31, 2011
Equity [Abstract]
Regular quarterly dividend declared	$ 0.035
Special dividend declared	$ 0.05

X

- Definition

Regular quarterly dividend declared

+ References

No definition available.

+ Details

Name:	acfn_RegularQuarterlyDividendDeclared
Namespace Prefix:	acfn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Special dividend declared

+ References

No definition available.

+ Details

Name:	acfn_SpecialDividendDeclared
Namespace Prefix:	acfn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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