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Note 8 - Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Issuance Date

 

February 1, 2019

   

December 20, 2019

   

March 1, 2020

   

March 1, 2021

 

Fair value lower range

  $ 2.81     $ 1.58     $ 1.46     $ 4.34  

Fair value higher range

  $ 2.86     $ 1.61     $ 1.49     $ 4.43  

Exercise price

  $ 4.72     $ 2.56     $ 2.33     $ 6.33  

Expected term (in years)

    1.0 - 1.3       1.0 - 1.6       1.0 - 1.5       1.0 - 1.3  

Expected volatility

    65 %     70 %     70 %     80 %

Dividend yield

    %     %     %     %

Risk-free rate

    2.61 %     1.85 %     1.05 %     1.18 %
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   

Number of options

   

Weighted average exercise price per share

   

Weighted average remaining contractual term (in years)

   

Aggregate intrinsic value

 

Outstanding as of December 31, 2020

    2,294,000     $ 4.34       8.0     $ 2,256  

Granted

    108,000     $ 6.33       9.7        

Exercised

    (198,000 )                        

Outstanding as of June 30, 2021

    2,204,000     $ 4.41       7.6     $ 190  

Options exercisable as of June 30, 2021

    1,307,000     $ 4.06       7.5     $ 190  
Schedule of Nonvested Share Activity [Table Text Block]
   

Number of options

   

Weighted average exercise price per share

   

Weighted average remaining contractual term (in years)

 

Unvested as of December 31, 2020

    1,225,000     $ 3.93       8.4  

Granted

    108,000     $ 6.33       9.7  

Vested

    (436,000 )              

Unvested as of June 30, 2021

    897,000     $ 4.91       7.8  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   

Number of units

   

Weighted average grant-date fair value

 

Unvested as of December 31, 2020

    3,377,097     $ 7.09  

Granted

    1,043,660     $ 5.88  

Vested and delivered

    (1,824,153 )   $ 2.98  

Withheld as treasury stock (1)

    (122,965 )   $ 4.91  

Vested not delivered (2)

    570,335     $ 2.70  

Forfeited

    (200,404 )   $ 4.20  

Unvested as of June 30, 2021

    2,843,570     $ 8.69  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended June 30,

   

Six Months Ended June 30,

 
   

2021

   

2020

   

2021

   

2020

 

Sales and marketing

  $ 209     $ 269     $ 372     $ 487  

Product development

    233       286       501       523  

General and administrative

    759       726       1,559       2,668  

Share-based compensation expense

    1,201       1,281       2,432       3,678  

Capitalized in intangible assets

    30       47       71       86  

Total share-based compensation

  $ 1,231     $ 1,328     $ 2,503     $ 3,764