The Company uses the two-class method of computing basic EPS due to the existence of non-vested restricted stock awards with nonforfeitable rights to dividends or dividend equivalents (referred to as participating securities). For the three and nine months ended September 30, 2018 and 2017, no significant adjustments were made to net income for purposes of calculating basic and diluted EPS. The following is a reconciliation of the weighted average shares used in diluted EPS computations.

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Weighted average common shares-basic		18,562,204		18,180,845		18,460,848		18,071,093
Effect of dilutive securities
Unexercised stock options and stock purchase plan		—		249,667		312,320		164,716
Unvested restricted stock awards and units		—		142,279		91,001		158,733
Weighted average common shares-diluted		18,562,204		18,572,791		18,864,169		18,394,542

There were 2,088,843 and 503,757 weighted average outstanding stock options and restricted stock awards and units not included in the diluted EPS computation for the three months ended September 30, 2018 and 2017, respectively, and 359,172 and 534,288 weighted average outstanding stock options and restricted stock awards and units not included in the diluted EPS computation for the nine months ended September 30, 2018 and 2017, respectively, because inclusion of these awards was anti-dilutive, a loss from continuing operations for the three months ended September 30, 2018, or, for performance-based and market-based restricted stock awards and units, all necessary conditions had not been satisfied by the end of the respective period.