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Note 11 - Variable Interest Entities (Details) - Summary Financial Information of Myers Included in the Consolidated Statements of Operations (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Note 11 - Variable Interest Entities (Details) - Summary Financial Information of Myers Included in the Consolidated Statements of Operations [Line Items]    
Revenues $ 134,538 $ 111,035
Operating income 441 (7,883)
Net income attributable to Sterling common stockholders 205 (4,580)
Variable Interest Entity, Primary Beneficiary [Member]
    
Note 11 - Variable Interest Entities (Details) - Summary Financial Information of Myers Included in the Consolidated Statements of Operations [Line Items]    
Revenues 16,861 10,789
Operating income 550 372
Net income attributable to Sterling common stockholders $ 275 $ 121