Computations of basic and diluted weighted average common shares outstanding were as follows: (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Income (loss) per share
Weighted-average common shares outstanding – basic	23,934,361	24,012,333	24,136,506	23,992,203
Dilutive effect of options and restricted stock units	385,870	509,375	470,736
Weighted-average common shares outstanding – diluted	24,320,231	24,521,708	24,607,242	23,992,203
Options and restricted stock units excluded from the computation of diluted loss per share because the effect of inclusion would have been anti-dilutive				726,250