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Note 13 - Net Loss Per Share Attributable to Sterling Common Stockholders (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Years Ended December 31,
    2015   2014   2013
Numerator:                        
Net loss attributable to Sterling common stockholders   $ (20,402 )   $ (9,781 )   $ (73,929 )
Revaluation of noncontrolling interest due to a new agreement or a put/call liability reflected in additional paid in capital or retained earnings, net of tax     (18,774 )     --       (7,686 )
    $ (39,176 )   $ (9,781 )   $ (81,615 )
Denominator:                        
Weighted average common shares outstanding — basic     19,375       18,063       16,635  
Shares for dilutive unvested stock and stock options     --       --       --  
Weighted average common shares outstanding and assumed
conversions— diluted
    19,375       18,063       16,635  
Basic and diluted net loss per share attributable to Sterling common stockholders   $ (2.02 )   $ (0.54 )   $ (4.91 )