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Consolidated Statements of Cash Flows (unaudited) [Acquisition of Business] (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2010
Jun. 30, 2010
Assets/liabilities acquired in the acquisition:    
Gain on step-up of investment $ 1,327 $ 1,327
USSI
    
Assets/liabilities acquired in the acquisition:    
Other current assets (55) (55)
Property and equipment (56) (56)
Intangibles (2,565) (2,565)
Goodwill (1,402) (1,402)
Current liabilities 285 285
Prior year investment in USSI 200 200
Non-controlling interests 3,600 3,600
Acquisition of businesses, net of cash acquired   7
Decision Dynamics
    
Assets/liabilities acquired in the acquisition:    
Value of Acorn shares issued in the acquisition 5,640 5,640
Gridsense
    
Assets/liabilities acquired in the acquisition:    
Inventory (833) (833)
Other current assets (482) (482)
Property and equipment (71) (71)
Other assets (370) (370)
Intangibles (2,314) (2,314)
Goodwill (3,655) (3,655)
Current liabilities 2,003 2,003
Short-term and long-term debt 113 113
Gain on step-up of investment   1,327
Consideration paid - see Note 4(b) for detail 4,406 4,406
Less cash included in consideration paid (1,476) (1,476)
Value of Acorn shares issued in the acquisition 1,867 1,867
Acquisition of businesses, net of cash acquired   (1,352)
OMI
    
Assets/liabilities acquired in the acquisition:    
Other current assets (39) (39)
Property and equipment (41) (41)
Intangibles (322) (322)
Current liabilities 402 402
Acquisition of businesses, net of cash acquired   $ 0