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Note 9 - Convertible Note (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques, Embedded Derivative [Table Text Block]

Stock price

 $0.72 

Equity volatility

  80.1

%

Risk-free interest rate

  4.88

%

Dividend yield

  0.0

%

Remaining term

  0.8 

Assumption

 

As of

June 9, 2023

 

Stock price

 $0.75 

Equity volatility

  76.9

%

Risk-free interest rate

  5.41

%

Remaining term

  0.7 
Schedule of Long-Term Debt Instruments [Table Text Block]

(in thousands)

    

Principal amount

 $2,567 

Unamortized discount

  (1,136

)

Unamortized debt issuance costs

  (161

)

Total Convertible Note, net

  1,270 
Schedule of Maturities of Long-Term Debt [Table Text Block]

(in thousands)

    

Remainder of 2023

 $550 

2024

  2,017 

Total

 $2,567