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Note 9 - Debentures (Tables) | 6 Months Ended
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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 |

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