Net Loss Per Common Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net Loss Per Common Share

3.     Net Loss Per Common Share

Basic and dilutive net loss per common share were as follows:

	Quarters Ended March 31,
	2021		2020
Net loss applicable to common stockholders	$	(59,783)	$	(657,371)
Weighted average number of common shares outstanding, basic	3,796,120		1,457,224
Dilutive convertible preferred stock	—		—
Weighted average number of common shares outstanding, dilutive	3,796,120		1,457,224
Net loss per common share applicable to common stockholders, basic and diluted	$	(0.02)	$	(0.45)

Shares underlying the following potentially dilutive weighted average number of common stock equivalents were excluded from the calculation of diluted net loss per common share because their effect was anti-dilutive for each of the periods presented: 

	Quarters Ended March 31,
	2021	2020
Options	368,510	164,091
Warrants	—	42,086
Convertible preferred stock	62	62
Total	368,572	206,239

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Quarters Ended March 31,
	2021		2020
Net loss applicable to common stockholders	$	(59,783)	$	(657,371)
Weighted average number of common shares outstanding, basic	3,796,120		1,457,224
Dilutive convertible preferred stock	—		—
Weighted average number of common shares outstanding, dilutive	3,796,120		1,457,224
Net loss per common share applicable to common stockholders, basic and diluted	$	(0.02)	$	(0.45)