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Note 12 - Net Income (Loss) Per Share Attributable to Sterling Common Stockholders - Basic Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income (loss) attributable to Sterling common stockholders	$ 3,662	$ 2,023	$ 1,405	$ (5,305)
Weighted average common shares outstanding — basic (in shares)	26,978	22,762	25,972	21,261
Shares for dilutive unvested stock and warrants (in shares)	358	197	437
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted (in shares)	27,336	22,959	26,409	21,261
Basic (in dollars per share)	$ 0.14	$ 0.09	$ 0.05	$ (0.25)
Diluted (in dollars per share)	$ 0.13	$ 0.09	$ 0.05	$ (0.25)

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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