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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Revenue $ 5,922 $ 5,490
Cost of sales 1,791 1,900
Gross profit 4,131 3,590
Operating expenses:    
Research and development expenses 619 559
Selling, general and administrative expenses 3,822 3,730
Total operating expenses 4,441 4,289
Operating loss (310) (699)
Finance expense, net (35) 2
Gain on SBA PPP loan extinguishment 421
Income (loss) before income taxes 76 (697)
Income tax expense
Net income (loss) after income taxes 76 (697)
Gain on sale of interest in DSIT, net of transaction costs 50
Net income (loss) 76 (647)
Non-controlling interest share of (income) loss (7) 29
Net income (loss) attributable to Acorn Energy, Inc. shareholders. $ 69 $ (618)
Basic and diluted net income (loss) per share attributable to Acorn Energy, Inc. shareholders:    
Net income (loss) per share attributable to Acorn Energy, Inc. shareholders - basic and diluted $ 0.00 $ (0.02)
Weighted average number of shares outstanding attributable to Acorn Energy, Inc. shareholders - basic 39,674,000 35,495,000
Weighted average number of shares outstanding attributable to Acorn Energy, Inc. shareholders - diluted 39,713,000 35,495,000