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Note 8 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 11, 2024 | Mar. 08, 2024 | Jan. 02, 2024 | Jan. 03, 2023 | Dec. 31, 2023 | [1] | Dec. 31, 2022
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  | $ 1.45 | $ 4.43
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 805,350 | 865,825
Executives and Key Personnel [Member] |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.38 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 406,250 |  |
Director [Member] |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.38 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 262,500 |  |
Director [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |
Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |
Consultant [Member] |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  | $ 1.38 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 15,000 |  |
Consultant [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |
Subsequent Event [Member] |  |  |  |  |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 1.59 |  |  |
Subsequent Event [Member] | Senior Secured 2024 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |  |  |  |
Debt Instrument, Face Amount |  | $ 6,000,000 |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 1.79 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage, Default |  | 18.00% |  |  |  |
Debt Instrument, Maturity Date |  | Mar. 08, 2027 |  |  |  |
Subsequent Event [Member] | Senior Secured 2024 Notes [Member] | Forecast [Member] |  |  |  |  |  |
Proceeds from Issuance of Senior Long-Term Debt |  | $ 5,850,000 |  |  |  |
Subsequent Event [Member] | Executives and Key Personnel [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 387,500 |  |  |
Subsequent Event [Member] | Executives and Key Personnel [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |  |
Subsequent Event [Member] | Director [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 352,500 |  |  |
Subsequent Event [Member] | Director [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 1 year |  |  |
Subsequent Event [Member] | Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 212,709 |  | 141,510 |  |  |
Subsequent Event [Member] | Nonexecutive Employees [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 17,600 |  |  |
Subsequent Event [Member] | Nonexecutive Employees [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |  |
Subsequent Event [Member] | Consultant [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 15,000 |  |  |
Subsequent Event [Member] | Consultant [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 1 year |  |  |
[1] | Represents the following stock options granted: • Annual share-based compensation awards on January 3, 2023, including: (a) 406,250 stock options with an exercise price of $1.38 per share granted to executives and key personnel, upon one year anniversary, or vesting annually in equal installments over four years, (b) 262,500 stock options with an exercise price of $1.38 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 24,100 stock options with an exercise price of $1.38 per share granted to employees, vesting annually in equal installments over four years, and (d) 15,000 stock options with an exercise price of $1.38 per share granted to a consultant, vesting upon one year anniversary. • Throughout the year the following stock options were granted: (a) on May 30, 2023, 37,500 stock options with an exercise price of $2.23 per share granted to a consultant, vesting over two months from the grant date, (b) on September 15, 2023, 55,000 stock options with an exercise price of $1.75 per share granted to a consultant, vesting over a year and half from the grant date, and (c) on October 23, 2023, 5,000 stock options with an exercise price of $1.66 per share granted to an employee vesting annually in equal installments over four years.

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