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Note 12 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value Assumptions of Warrants [Table Text Block]
  

November 2021

Warrants

  

July 2020

Warrants

 

Expected price volatility

  79.6

%

  79.6

%

Expected term (in years)

  5.4   3.4 

Risk-free interest rate

  3.43

%

  3.58

%

Dividend yield

  0.00

%

  0.00

%

Weighted-average fair value of warrants

 $3.15  $0.70 
  

November 2021

Warrants

  

July 2020

Warrants

 

Expected price volatility

  79.6

%

  79.6

%

Expected term (in years)

  6.0   3.4 

Risk-free interest rate

  3.43

%

  3.58

%

Dividend yield

  0.00

%

  0.00

%

Weighted-average fair value of warrants

 $4.55  $3.50 
Schedule of Preferred Stock Assumptions [Table Text Block]

Expected price volatility

  79.6

%

Expected term (in years)

  1.3 

Risk-free interest rate

  3.64

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $8.05 

Expected price volatility

  79.6

%

Expected term (in years)

  1.3 

Risk-free interest rate

  3.64

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $2.10 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants
(in thousands)

  

Weighted-

Average

Exercise

Price

 

Outstanding at December 31, 2022

  2,306  $7.70 

Warrants granted

    $ 

Warrants expired

    $ 

Outstanding at March 31, 2023

  2,306  $7.70