Diluted net income per share attributable to common stockholders is based upon the weighted-average number of shares of common stock outstanding and the weighted-average number of shares outstanding assuming the issuance of common stock upon exercise of warrants to purchase common stock, and the vesting of restricted stock grants per ASC 260, “Earnings Per Share.”



	Three Months Ended March 31,
	2017	2016
Weighted-average number of shares outstanding:
Common stock	20,827,993	20,702,103
Common stock equivalents-stock options, grants	47,052	71,364
Diluted shares outstanding	20,875,045	20,773,467