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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
OmniMetrix acquistion [Member]
Cash flows provided by (used in) operating activities:        
Net income (loss) before non-controlling interests $ (30,989) $ (17,735) $ 34,320  
Less net (income) loss from discontinued operations 0 0 29,121  
Net income (loss) from continuing operations (30,989) (17,735) 5,199  
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities 13,186 (4,508) (13,038)  
Net Cash Provided by (Used in) Operating Activities, Continuing Operations (17,803) (22,243) (7,839)  
Cash flows provided by (used in) investing activities:        
Acquisitions of property and equipment (3,466) (684) (502)  
Acquisition of license 0 (150) 0  
Restricted deposits (114) (508) (1,930)  
Release of restricted deposits 622 2,188 839  
Advances to CoaLogix prior to sale 0 0 (278)  
Amounts funded for severance assets (268) (476) (315)  
Proceeds from the sale of Coreworx debt and shares 0 0 100  
Proceeds from the sale of CoaLogix, net of CoaLogix cash 0 0 62,117  
Proceeds from the sale of HangXing 0 0 492  
Escrow deposits from Coalogix sale 0 0 (6,308)  
Proceeds from the sale of OMI 281 0 0  
Release of escrow deposits 0 5,961 347  
Investment in short-term deposits 0 (8,015) (18,000)  
Maturity of short-term deposits 0 26,015 0  
Acquisition of OmniMetrix, net of cash acquired 0 (7,835) 0  
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (2,945) 16,496 36,562  
Cash flows provided by (used in) financing activities:        
Proceeds from capital raises, net of transaction costs 10,375 0 0  
Proceeds from employee stock option and warrant exercises 0 1,355 211  
Short-term bank credit, net 2,303 (510) (557)  
Proceeds from borrowings of long-term debt 0 16 68  
Repayments of long-term debt (159) (173) (342)  
Dividends paid (517) (3,208) (613)  
Other 0 0 30  
Net cash provided by (used in) financing activities - continuing operations 12,002 (2,520) (1,203)  
Discontinued operations:        
Operating cash flows 0 0 (2,020)  
Investing cash flows 0 0 (187)  
Financing cash flows 0 0 1,683  
Net cash provided by (used in) discontinued operations 0 0 (524)  
Effect of exchange rate changes on cash and cash equivalents (122) 134 (72)  
Net increase (decrease) in cash and cash equivalents (8,868) (8,133) 26,924  
Cash and cash equivalents at beginning of the year of discontinued operations 0 0 807  
Cash and cash equivalents at beginning of year of continuing operations 26,147 34,280 6,549  
Cash and cash equivalents at end of year before removing disc ops cash 17,279 26,147 34,280  
Interest 58 72 144  
Income taxes, net of refunds (2,008) 216 2,180  
A. Adjustments to reconcile net income (loss) to net cash used in operating activities:        
Depreciation and amortization 1,456 1,406 851  
Change in deferred taxes 154 (1,832) (14,657)  
Impairments of goodwill and intangibles 6,731 0 0  
Impairment of fixed assets in restructurings 573 0 0  
Inventory Write-down 1,121 357 0  
Impairment of fixed assets 800 0 0  
Increase in liability for accrued severance 307 573 390  
Gain on sale of HangXing 0 0 (492)  
Gain on sale of Bushing IQ (116) 0 0  
Stock and stock compensation expense 1,219 855 458  
Other 41 15 (87)  
Change in operating assets and liabilities:        
(Increase) Decrease in Accounts Receivable (262) (181) 305  
(Increase) Decrease in unbilled revenue (1,208) (1,435) 28  
(Increase) Decrease in other current assets and other assets 1,722 (2,365) (422)  
Increase in inventory (695) (3,076) (1,027)  
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, other current liabilities and other liabilities 1,343 1,175 1,615  
Adjustments to reconcile net income (loss) to net cash used in operating activities (see Schedule A): 13,186 (4,508) (13,038)  
B. Non-cash items:        
Adjustment of Additional Paid In Capital and Noncontrolling Interests from Investment in Noncontrolling Interests From Additional Investment Option by Acorn 202 1,067 600  
Stock Issued During Period, Value, Dividend Reinvestment Plan 117 175 0  
Issuance of Stock and Warrants for Services or Claims 482      
Value of shares issued as compensation     101  
Dividends payable - paid in following period     876  
C. Assets/liabilities acquired in the acquisition of OmniMetrix        
Accounts receivable       (328)
Inventory       (234)
Other current assets       (10)
Property and equipment       (26)
Intangible assets       (5,581)
Goodwill (4,429) (6,630) (4,637) (1,930)
Current liabilities       274
Payments to Acquire Businesses, Net of Cash Acquired       $ (7,835)