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Note 9 - Debentures (Tables)
6 Months Ended
Jun. 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 30, 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

 $3,117 

Unamortized discount

  (1,696)

Unamortized debt issuance costs

  (236)

Total Convertible Note, net

  1,185 
Schedule of Maturities of Long-Term Debt [Table Text Block]

(in thousands)

    

Remainder of 2023

 $1,100 

2024

  2,017 

Total

 $3,117