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Note 10 - Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 200,000 100,000