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Note 4 - Basic and Diluted Loss Per Common Share
 6 Months Ended
Jun. 30, 2020
Notes to Financial Statements  
Earnings Per Share [Text Block]
4.
           Basic and Diluted Loss Per Common Share
 
Basic and diluted loss per common share are computed based on the weighted average number of common shares outstanding. Common share equivalents consist of common shares issuable upon conversion of convertible preferred stock, and upon exercise of stock options and stock purchase warrants. All common share equivalents are excluded from the computation of diluted loss per share since the effect would be anti-dilutive. The weighted average number of common share equivalents which were excluded from the computation of diluted loss per share, totaled
1,340,187
and
1,103,815
shares for the
three
-month and
six
-month periods ended
June 30, 2020,
respectively, as compared to
188
and
176
shares for the
three
-month and
six
-month periods ended
June 30, 2019,
respectively. See Note
10
for more information concerning our outstanding common share equivalents at
June 30, 2020
that could potentially dilute earnings per share in the future.