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Note 12 - Net (Loss) Income per Share Attributable to Sterling Common Stockholders (Details)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount