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Note 15 - Net Loss Per Share Attributable to Sterling Common Stockholders (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 152,900us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 160,206us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 109,424us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount