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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basic and Diluted Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 1,826,000 867,000 2,095,000
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income (loss) attributable to Acorn Energy, Inc. $ (5,383) $ (3,935) $ (3,204) $ (4,189) $ (1,091) $ 40,796 $ (2,079) $ (2,217) $ (16,711) $ 35,409 $ (25,088)
Weighted Average Number of Shares Outstanding, Basic 18,038,000 17,934,000 17,912,000 17,680,000 17,521,000 17,508,000 17,489,000 17,449,000 17,891,000 17,462,000 14,910,000
Incremental Common Shares Attributable to Warrants Outstanding                 0 26,000 0
Incremental Common Shares Attributable to Stock Options                 0 255,000 0
Weighted Average Number of Shares Outstanding, Diluted 18,038,000 17,934,000 17,912,000 17,680,000 17,521,000 17,810,000 17,489,000 17,449,000 17,891,000 17,743,000 14,910,000
Earnings Per Share, Basic $ (0.30) $ (0.22) $ (0.18) $ (0.24) $ (0.06) $ 2.33 $ (0.12) $ (0.13) $ (0.93) $ 2.03 $ (1.68)
Earnings Per Share, Diluted         $ (0.06) $ 2.29 $ (0.12) $ (0.13) $ (0.93) $ 1.99 $ (1.68)