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Note 13 - Basic Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income (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)
Weighted average common shares outstanding — basic (in shares) 19,375,000 18,063,000 16,635,000
Shares for dilutive unvested stock and stock options (in shares)
Weighted average common shares outstanding and assumed conversions— diluted (in shares) 19,375,213 18,063,466 16,635,179
Basic and diluted net loss per share attributable to Sterling common stockholders (in dollars per share) $ (2.02) $ (0.54) $ (4.91)