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Note 1 - Summary of Business and Significant Accounting Policies (Detail) - The following table reconciles the numerators and denominators of the 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
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:          
Net income (loss) attributable to Sterling common stockholders   $ 4,200 $ (297) $ (35,900) $ 19,087
Revaluation of noncontrolling interest put/call liability reflected in additional paid in capital or retained earnings, net of tax     (3,992) (824) (449)
    $ (4,289) $ (36,724) $ 18,638
Denominator:          
Weighted average common shares outstanding — basic (in Shares)     16,420,886 16,395,739 16,194,708
Shares for dilutive stock options and warrants (in Shares)         368,000
Weighted average common shares outstanding and assumed conversions— diluted (in Shares)     16,420,886 16,395,739 16,563,169
Basic net income (loss) per share attributable to Sterling common stockholders (in Dollars per share)     $ (0.26) $ (2.24) $ 1.15
Diluted net income (loss) per share attributable to Sterling common stockholders (in Dollars per share) $ 0.27 $ 0.26 $ (0.26) $ (2.24) $ 1.13