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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
GridSense acquistion [Member]
Dec. 31, 2010
USSI acquistion [Member]
Dec. 31, 2010
OMI acquistion [Member]
Dec. 31, 2012
OmniMetrix acquistion [Member]
Cash flows provided by (used in) operating activities:              
Net income (loss) before non-controlling interests $ (17,735) $ 34,320 $ (25,750)        
Less net (income) loss from discontinued operations 0 (29,121) 17,969        
Net income (loss) from continuing operations (17,735) 5,199 (7,781)        
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities (4,508) (13,038) 1,527        
Net Cash Provided by (Used in) Operating Activities, Continuing Operations (22,243) (7,839) (6,254)        
Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A): (4,508) (13,038) 1,527        
Cash flows provided by (used in) investing activities:              
Acquisitions of property and equipment 684 502 237        
Acquisition of license (150) 0 0        
Proceeds from the sale of EnerTech 0 0 1,116        
Restricted deposits 508 1,930 1,301        
Release of restricted deposits (2,188) (839) (1,029)        
Investment in EnerTech 0 0 (900)        
Investment in and loans to GridSense prior to acquisition 0 0 (200)        
Proceeds From (Payments For) Advances From Coalogix Prior To Sale 0 (278) 0        
Amounts funded for severance assets 476 315 281        
Proceeds from the sale of Coreworx debt and shares 0 100 0        
Proceeds from the sale of CoaLogix net of CoaLogix cash 0 62,117 0        
Proceeds from the sale of HangXing 0 492 0        
Escrow deposits from Coalogix sale 0 (6,308) 0        
Release of escrow deposits 5,961 347 0        
Short-term deposit 8,015 18,000 0        
Maturity of short-term deposits 26,015 0 0        
Deconsolidation of Coreworx 0 0 (217)        
Acquisition of GridSense, net of cash acquired 0 0 (1,352)        
Acquisition of OMI net of cash acquired 0 0 0        
Payment to acquire OmniMetrix, net of cash acquired (7,835) 0 0        
Net Cash Provided by (Used in) Investing Activities, Continuing Operations 16,496 36,562 (2,336)        
Cash flows provided by (used in) financing activities:              
Proceeds from capital raises, net of transaction costs 0 0 15,176        
Proceeds from employee stock option and warrant exercises 1,355 211 220        
Issuance of shares to non-controlling interests in consolidated subsidiary 0 0 3,010        
Short-term bank credit, net (510) (557) 962        
Proceeds from borrowings of long-term debt 16 68 129        
Repayments of long-term debt (173) (342) (140)        
Dividends paid (3,208) (613) 0        
Other    30 62        
Net cash provided by (used in) financing activities - continuing operations (2,520) (1,203) 19,419        
Discontinued operations:              
Operating cash flows 0 (2,020) (8,536)        
Investing cash flows 0 (187) (7,051)        
Financing cash flows 0 1,683 479        
Net cash provided by (used in) discontinued operations 0 (524) (15,108)        
Effect of exchange rate changes on cash and cash equivalents 134 (72) 273        
Effect of Exchange Rate on Cash and Cash Equivalents, Discontinued Operations 0 0 154        
Net increase (decrease) in cash and cash equivalents (8,133) 26,924 (3,852)        
Cash and cash equivalents at beginning of the year of discontinued operations   0 807        
Cash and cash equivalents at beginning of year of continuing operations   34,280 6,549        
Cash and cash equivalents of discontinued operations 0 0 (807)        
Cash and cash equivalents held by continuing operations at the end of the period 26,147 34,280          
Interest 72 144 151        
Income taxes, net of refunds 216 2,180 (85)        
A. Adjustments to reconcile net income (loss) to net cash used in operating activities:              
Depreciation and amortization 1,406 851 603        
Change in deferred taxes 1,832 14,657 (23)        
Impairments 0 0 1,166        
Inventory Write-down 357 0 0        
Increase in liability for accrued severance 573 390 385        
Gain on investment in GridSense 0 0 (1,327)        
Loss on Sale of EnerTech 0 0 1,821        
Gain on sale of HangXing 0 (492) 0        
Stock and stock compensation expense 855 458 690        
Other 15 (87) 29        
Change in operating assets and liabilities:              
Increase (Decrease) in Accounts Receivable (181) 305 (2,659)        
Increase (Decrease) in unbilled revenue (1,435) 28 (1,806)        
Increase (Decrease) in other current assets and other assets (2,365) (422) 597        
Increase in inventory (3,076) (1,027) (203)        
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, other current liabilities and other liabilities 1,175 1,615 2,208        
Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A): (4,508) (13,038) 1,527        
B. Non-cash items:              
Adjustment of additional paid-in-capital and non-controlling interests from investment in discontinued operations by non-controlling interests     587        
Adjustment of Additional Paid In Capital and Noncontrolling Interests from Investment in Noncontrolling Interests From Additional Investment Option by Acorn 1,067 600 1,791        
Stock Issued During Period, Value, Dividend Reinvestment Plan 175 0          
Value of Entity Shares Issued in Acquisition     1,867        
Proceeds from Sale of Treasury Stock     2,229        
Issuance of Stock and Warrants for Services or Claims     153        
Value of shares issued as compensation   101          
Dividends payable - paid in following period   876          
C. Assets/liabilities acquired in the acquisition of USSI              
Accounts Receivable             (328)
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory       (833)     (234)
Other current assets       (482) (55) (39) (10)
Property and equipment       (71) (56) (41) (26)
Business Acquisition, Purchase Price Allocation, Other Assets       370      
Intangible assets       (2,314) (2,565) (322) (5,581)
Goodwill       3,655 1,402   1,930
Current liabilities       2,003 285 402 274
D. Assets/liabilities acquired in the acquisition of GridSense              
Accounts Receivable             (328)
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory       (833)     (234)
Other current assets       (482) (55) (39) (10)
Property and equipment       (71) (56) (41) (26)
Business Acquisition, Purchase Price Allocation, Other Assets       370      
Intangible assets       (2,314) (2,565) (322) (5,581)
Goodwill       3,655 1,402   1,930
Current liabilities       2,003 285 402 274
E. Assets/liabilities acquired in the acquisition of OMI              
Accounts Receivable             (328)
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory       (833)     (234)
Other current assets       (482) (55) (39) (10)
Property and equipment       (71) (56) (41) (26)
Business Acquisition, Purchase Price Allocation, Other Assets       370      
Intangible assets       (2,314) (2,565) (322) (5,581)
Goodwill       3,655 1,402   1,930
Current liabilities       2,003 285 402 274
F. Assets/liabilities acquired in the acquisition of OmniMetrix              
Accounts Receivable             (328)
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory       (833)     (234)
Other current assets       (482) (55) (39) (10)
Property and equipment       (71) (56) (41) (26)
Business Acquisition, Purchase Price Allocation, Other Assets       370      
Intangible assets       (2,314) (2,565) (322) (5,581)
Goodwill       3,655 1,402   1,930
Current liabilities       2,003 285 402 274
Business Acquisition, Purchase Price Allocation, Previously Invested Amounts         (200)    
Business Acquisition, Purchase Price Allocation, Noncontrolling Interest         (3,600)    
Payments to Acquire Businesses, Net of Cash Acquired 0 0 (7) (1,352) 7 0 (7,835)
Cash and cash equivalents at end of year before removing disc ops cash 26,147 34,280 7,356        
Cash and cash equivalents held by continuing operations at end of year 26,147 34,280 6,549        
Short Term and Long Term Debt Acquired in Acquisition       113      
Business Acquisition, Purchase Price Allocation, Gain on Step-Up of Investment       (1,327)      
Business Acquisition, Cost of Acquired Entity, Purchase Price       (4,406)      
Consideration Paid in Acquisition       $ (1,476)