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Note 11 - Variable Interest Entities (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure Text Block [Abstract]  
Schedule of Variable Interest Entities [Table Text Block]
   
September 30,
2014
   
December 31,
2013
 
Assets:
           
Current assets:
           
Cash and cash equivalents
  $ 283     $ 566  
Contracts receivable, including retainage
    25,808       6,475  
Other current assets
    3,865       7,964  
Total current assets
    29,956       15,005  
Property and equipment, net
    8,985       6,869  
Other assets, net
    -       5  
Goodwill
    1,501       1,501  
Total assets
  $ 40,442     $ 23,380  
Liabilities:
               
Current liabilities:
               
Accounts payable
  $ 14,777     $ 8,361  
Other current liabilities
    13,061       7,080  
Total current liabilities
    27,838       15,441  
Long-term liabilities:
               
Other long-term liabilities
    38       137  
Total liabilities
  $ 27,876     $ 15,578  
Schedule of Variable Interest Entity Income [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
   
2014
 
2013
 
2014
 
2013
Revenues
  $ 40,159     $ 23,240     $ 101,953     $ 59,377  
Operating income
    3,461       1,772       6,760       3,130  
Net income attributable to Sterling common stockholders 
    1,728       575       3,376       1,016