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EQUITY Dividends (Details) (USD $) | 12 Months Ended
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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