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Note 11 - Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2014
Disclosure Text Block [Abstract]  
Schedule of Variable Interest Entities [Table Text Block]
   
June 30,
2014
   
December 31,
2013
 
Assets:
           
Current assets:
           
Cash and cash equivalents
  $ 498     $ 566  
Contracts receivable, including retainage
    21,859       6,475  
Other current assets
    11,572       7,964  
Total current assets
    33,929       15,005  
Property and equipment, net
    7,896       6,869  
Other assets, net
    5       5  
Goodwill
    1,501       1,501  
Total assets
  $ 43,331     $ 23,380  
Liabilities:
               
Current liabilities:
               
Accounts payable
  $ 21,946     $ 8,361  
Other current liabilities
    12,235       7,080  
Total current liabilities
    34,181       15,441  
Long-term liabilities:
               
Other long-term liabilities
    41       137  
Total liabilities
  $ 34,222     $ 15,578  
Schedule of Variable Interest Entity Income [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2014
   
2013
   
2014
   
2013
 
Revenues
  $ 44,933     $ 25,348     $ 61,794     $ 36,137  
Operating income
    2,749       985       3,299       1,358  
Net income attributable to Sterling common stockholders 
    1,373       320       1,648       441