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Note 1 - Summary of Business and Significant Accounting Policies (Details) - Reconciliation of Numerators and Denominators of Basic and Diluted per Common Share Computations for Net Income (Loss): (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net loss attributable to Sterling common stockholders $ (52,135) $ (189) $ (17,025) $ (4,580) $ 2,926 $ 990 $ 3,287 $ (7,500) $ (73,929) $ (297) $ (35,900)
Revaluation of noncontrolling interest put/call liability reflected in additional paid in capital or retained earnings, net of tax                 (7,686) (3,992) (824)
                $ (81,615) $ (4,289) $ (36,724)
Denominator:                      
Weighted average common shares outstanding — basic (in Shares)                 16,635,179 16,420,886 16,395,739
Weighted average common shares outstanding and assumed conversions— diluted (in Shares)                 16,635,179 16,420,886 16,395,739
Basic net loss per share attributable to Sterling common stockholders (in Dollars per share)                 $ (4.91) $ (0.26) $ (2.24)
Diluted net loss per share attributable to Sterling common stockholders (in Dollars per share)               $ 0.27 $ (4.91) $ (0.26) $ (2.24)