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Note 11 - Variable Interest Entities (Tables)
9 Months Ended
Sep. 30, 2013
Variable Interest Entities [Abstract]  
Schedule of Variable Interest Entities [Table Text Block]
   
September 30,
2013
   
December 31,
2012
 
Assets:
           
Current assets:
           
Cash and cash equivalents
  $ -     $ 7,164  
Contracts receivable, including retainage
    10,943       2,866  
Other current assets
    8,185       1,214  
Total current assets
    19,128       11,244  
Property and equipment, net
    5,898       3,041  
Other assets, net
    5       -  
Goodwill
    1,501       1,501  
Total assets
  $ 26,532     $ 15,786  
Liabilities:
               
Current liabilities:
               
Accounts payable
  $ 8,080     $ 4,627  
Other current liabilities
    11,283       6,283  
Total liabilities
  $ 19,363     $ 10,910  
Schedule of Variable Interest Entity Income [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2013
   
2012
   
2013
   
2012
 
Revenues
  $ 23,240     $ 39,972     $ 59,377     $ 63,542  
Operating income
    1,772       1,917       3,130       2,519  
Net income attributable to Sterling common stockholders 
    575       621       1,016       813