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Note 4 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Description

 

Outstanding 12/31/2021

  

Exercised

  

Outstanding 3/31/22

  

Exercise Price

  

Remaining Contractual Term
(in years)

  

Aggregate Intrinsic Value (in thousands)

 

June 2017 Warrants

  2,457,501   -   2,457,501  $7.50   5.2  $- 

November 2020 Warrants

  4,109,344   -   4,109,344  $4.31   3.6  $- 

SVB Warrants

  29,251   -   29,251  $6.41   5.4  $- 

Total Warrants

  6,596,096   -   6,596,096  $4.47   4.2   - 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Number of

Options

   

Weighted

Average

Exercise

Price

   

Weighted

Average

Remaining

Contractual

Term

(in years)

   

Aggregate

Intrinsic

Value

(in thousands)

 

Outstanding, December 31, 2021

    3,498,297     $ 10.07       7.27     $ 7,456  

Granted

    760,000       5.07                  

Exercised, cancelled, or forfeited

    (69,291

)

    14.44                  

Outstanding, March 31, 2022

    4,189,006     $ 9.08       7.64     $ 946  
                                 

Exercisable, March 31, 2022

    2,116,338     $ 10.75       6.1     $ 629