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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Intangibles acquired by discontinued operations in consideration for future royalties     $ 99
Adjustment of additional paid-in-capital and non-controlling interests from investment in discontinued operations by non-controlling interests   587 596
Cash flows provided by (used in) operating activities:      
Net income (loss) before non-controlling interests 34,320 (25,750) (6,176)
Less net (income) loss from discontinued operations (29,121) 17,969 6,076
Net income (loss) from continuing operations 5,199 (7,781) (100)
Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A): (13,038) 1,527 (1,312)
Net cash used in operating activities - continuing operations (7,839) (6,254) (1,412)
Cash flows provided by (used in) investing activities:      
Restricted deposits (1,930) (1,301) (971)
Release of restricted deposits 839 1,029 2,468
Loan to GridSense prior to acquisition 0 (200) (550)
Advances from CoaLogix prior to sale (278) 0 0
Proceeds from the sale of CoaLogix net of CoaLogix cash 62,117 0 0
Proceeds from the sale of equity method investees 492 0 0
Escrow deposits from CoaLogix sale (6,308) 0 0
Amounts funded for severance assets (315) (281) (377)
Acquisitions of property and equipment (502) (237) (240)
Net cash provided by (used in) investing activities - continuing operations 36,562 (2,336) 3,120
Cash flows provided by (used in) financing activities:      
Proceeds from capital raise, net of transaction costs 0 15,176 0
Issuance of shares to non-controlling interests in consolidated subsidiary 0 3,010 2,873
Exercise of options and warrants 211 220 2,342
Proceeds from borrowings of long-term debt 68 129 530
Repayments of long-term debt (342) (140) (4)
Other 31 62 0
Net cash provided by (used in) financing activities - continuing operations (1,203) 19,419 857
Purchase of additional shares in DSIT 0 0 (294)
Discontinued operations:      
Operating cash flows (2,020) (8,536) (4,016)
Financing cash flows 1,683 479 (54)
Net cash used in discontinued operations (524) (15,108) (6,520)
Effect of exchange rate changes on cash and cash equivalents (72) 273 0
Effect of exchange rate changes on cash and cash equivalents of discontinued operations 0 154 21
Net increase (decrease) in cash and cash equivalents 26,924 (3,852) (3,934)
Interest 144 151 267
Cash and cash equivalents at the beginning of the period of discontinued operations (807) (3,175)  
Cash and cash equivalents of discontinued operations 0 (807) (3,175)
Cash and cash equivalents held by continuing operations at the end of the period 34,280 6,549  
Cash and cash equivalents held by continuing operations at end of year 34,280 6,549 8,033
A. Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depreciation and amortization 851 603 216
Exchange rate adjustment on amounts funded for severance assets net of exchange adjustment on accrued severance (75) 58 0
Increase in liability for accrued severance 390 385 453
Amortization of stock-based deferred compensation 458 690 678
Deferred taxes (13,206) 23 (250)
Gain on investment in GridSense 0 (1,327) 0
Gain on sale of HangXing (492) 0 0
Change in operating assets and liabilities:      
Increase in inventory (1,027) (203) 0
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, other current liabilities and other liabilities 164 2,208 (200)
Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A): (13,038) 1,527 (1,312)
B. Non-cash items:      
Value of shares issued as compensation 101    
Adjustment of additional paid-in-capital and non-controlling from exercise of option by Acorn in USSI 600 1,791  
treasury shares issued in acquisition   0  
Issuance of Stock and Warrants for Services or Claims   153  
Dividends, Cash 876    
Assets/liabilities acquired in the acquisition:      
Prior year investment in USSI 0 0 (200)
Non-controlling interests   3,600  
Acquisition of businesses 0 7 0
Acquisition of GridSense, net of cash acquired (see Schedule D) 0 (1,352) 0
Proceeds from the sale of Comverge shares 0 0 3,990
Proceeds from the sale of EnerTech 0 1,116 0
Investment in EnerTech 0 (900) (1,000)
Proceeds from the sale of Coreworx debt and shares 100 0 0
Release of escrow deposits 347 0 0
Investment in short-term deposits (18,000) 0 0
Deconsolidation of Coreworx 0 (217) 0
Acquisition of treasury shares 0 0 (1,108)
Repayment of notes payable to the former shareholders of Coreworx 0 0 (3,400)
Short-term bank credit, net (557) 962 (82)
Dividends paid (614) 0 0
Investing cash flows (187) (7,051) (2,450)
Income taxes, net of refunds 2,180 (85) (357)
Cash and cash equivalents at beginning of the year of discontinued operations   807 3,175
Cash and cash equivalents at beginning of year of continuing operations   6,549 8,033
Income (Loss) from Equity Method Investments 0 0 (263)
Share of losses in GridSense 0 0 129
Asset Impairment Charges 0 1,166 81
Exchange rate adjustment on restricted deposits    0 109
Exchange rate adjustment on long-term debt    (38) 0
Available-for-sale Securities, Gross Realized Gain (Loss) 0 0 (1,403)
Loss on Sale of Investments 0 1,821 0
Gain on Sale of Investments (492) 0 0
Gain (Loss) on Sale of Property Plant Equipment 0 0 6
Other Operating Activities, Cash Flow Statement (12) 9 4
Increase (Decrease) in Accounts Receivable 305 (2,659) 814
Increase (Decrease) in Unbilled Receivables 28 (1,806) (1,594)
Increase (Decrease) in Other Operating Assets (422) 597 (92)
Acquisition of OMI net of cash acquired (see Schedule E) 0 0 0
Cash and cash equivalents at end of year 34,280 7,356 11,208
USSI [Member]
      
B. Non-cash items:      
treasury shares issued in acquisition   2,229  
Assets/liabilities acquired in the acquisition:      
Other current assets   (55)  
Property and equipment   (56)  
Intangibles   (2,565)  
Goodwill   (1,402)  
Current liabilities   285  
Prior year investment in USSI   200  
Non-controlling interests   3,600  
Acquisition of businesses   (7)  
Gridsense [Member]
      
B. Non-cash items:      
Value of Acorn shares issued in the acquisition   1,867  
Assets/liabilities acquired in the acquisition:      
Inventory   (833)  
Other current assets   (482)  
Property and equipment   (71)  
Other assets   (370)  
Intangibles   (2,314)  
Goodwill   (3,655)  
Current liabilities   2,003  
Short term and long-term debt   113  
Gain on step-up of investment   1,327  
Consideration paid   4,406  
Less cash included in consideration paid   (1,476)  
Acquisition of businesses   1,352  
OMI [Member]
      
Assets/liabilities acquired in the acquisition:      
Other current assets   (39)  
Property and equipment   (41)  
Intangibles   (322)  
Current liabilities   402  
Acquisition of businesses   $ 0