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Note 15 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

February 16, 2023

  

Option Award

  

Modifications

  

Immediately Before

 

Immediately After

Range of fair values

 

0.000 -2.1414

 

1.322 -2.2424

Range of risk-free interest rates

 

3.82% - 4.99%

 

3.82% - 4.99%

Range of remaining contractual terms (in years) 

0.37 - 4.25

 

3.37 - 7.25

Range of weighted volatilities

 

66.96% - 103.39%

 

66.96% - 103.39%

Expected dividend yield

 

0.00%

 

0.00%