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Note 11 - Warrant Liability (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]

Expected price volatility

  79.6

%

Expected term (in years)

  6.0 

Risk-free interest rate

  3.43

%

Dividend yield

  0.0

%

Weighted-average fair value of warrants

 $4.55 

Expected price volatility

  79.5

%

Expected term (in years)

  5.8 

Risk-free interest rate

  3.93

%

Dividend yield

  0.0

%

Weighted-average fair value of warrants

 $1.40 

Expected price volatility

  87

%

Expected term (in years)

  6.0 

Risk-free interest rate

  1.31

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $8.75 

Expected price volatility

  91

%

Expected term (in years)

  6.0 

Risk-free interest rate

  1.65

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $7.00 

Expected price volatility

  79.6

%

Expected term (in years)

  6.0 

Risk-free interest rate

  3.43

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $4.55 

Expected price volatility

  79.5

%

Expected term (in years)

  5.8 

Risk-free interest rate

  3.93

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $1.40 

Expected price volatility

  79.6

%

Expected term (in years)

  3.4 

Risk-free interest rate

  3.58

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $3.50 

Expected price volatility

  79.5

%

Expected term (in years)

  3.2 

Risk-free interest rate

  4.15

%

Dividend yield

  0.00

%

Weighted-average fair value of warrants

 $1.05