Note 10 - Stock-Based Compensation Expense

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Text Block]

10.	Stock-Based Compensation Expense

Stock-based compensation expense related to our stock option plan was

$56,190

and $-

- during the

three

-month periods ended

March 31, 2021

and

2020,

respectively. Stock-based compensation expense related to stock options is recognized on a straight-line basis over the requisite service period for the award and is allocated to research and development expense or general and administrative expense based upon the related employee classification. As of

March

31,

2021,

there is

$599,320

of unrecognized compensation expense that is expected to be recognized over a weighted-average period of

2.7

years.

Additionally, during the

three

-month periods ended

March 31, 2021

and

2020

we recorded stock-based compensation expense of

$20,600

and

$6,000,

respectively, associated with common stock issued for consulting and financial advisory services. As of

March 31, 2021,

there is

$34,067

recorded as a prepaid expense for

one

of these arrangements, which will be recognized as expense during

2021

over the term of the related agreement.