Condensed Consolidated Statements of Changes in Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]		Additional Paid-In Capital [Member]	Warrants [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total Acorn Energy, Inc. Shareholders' Equity (Deficit) [Member]	Non-Controlling Interests [Member]	Total
Balances at Dec. 31, 2017	$ 303		$ 99,819	$ 1,600	$ (98,215)	$ (3,036)	$ 471	$ 281	$ 752
Balances, shares at Dec. 31, 2017	30,302
Adjustment of retained earnings in accordance with ASC 606					152		152		152
Net loss					(1,222)		(1,222)	(27)	(1,249)
Accrued dividend in OmniMetrix preferred shares								(25)	(25)
Shares granted in lieu of director fees		[1]	4				4		4
Shares granted in lieu of director fees, shares	19
Stock option compensation			7				7		7
Balances at Mar. 31, 2018	$ 303		99,830	1,600	(99,285)	(3,036)	(588)	229	(359)
Balances, shares at Mar. 31, 2018	30,321
Balances at Dec. 31, 2018	$ 304		100,340	1,118	(100,064)	(3,036)	(1,338)	108	(1,230)
Balances, shares at Dec. 31, 2018	30,358
Net loss					(237)		(237)	(24)	(261)
Accrued dividend in OmniMetrix preferred shares								$ (20)	(20)
Shares granted in lieu of director fees
Shares granted in lieu of director fees, shares
Stock option compensation			6				$ 6		6
Balances at Mar. 31, 2019	$ 304		$ 100,346	$ 1,118	$ (100,301)	$ (3,036)	$ (1,569)	$ 64	$ (1,505)
Balances, shares at Mar. 31, 2019	30,358

[1] Less than $1