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Note 10 - Related Party Transactions (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2021 | Jul. 10, 2017 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Mar. 02, 2021 | Mar. 01, 2021
Previous President and Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | $ (100,000) |  |  |  |  |  |  |
Employment Agreement, Base Compensation |  | 200,000 |  |  |  |  |  |  |
Consultant [Member] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | (100,000) |  |  |  |  |  |  |
Employment Agreement, Base Compensation |  | $ 200,000 |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  | $ 50,000 |  |  | $ 100,000 |  |  |
Interim Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 2,000,000 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 5 years |  |  |  |  |  |  |  |
Managing Director, China Operations [Member] |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  | 50,000 |  |  | 100,000 |  |  |
Director Clinical Affair [Member] |  |  |  |  |  |  |  |  |
Royalty Expense |  |  | 95,000 | $ 144,000 | $ 211,000 | 267,000 |  |  |
Professional Fees |  |  | 39,000 |  | 78,000 |  |  |  |
Accounts Payable and Accrued Liabilities, Current |  |  | 100,000 |  | 100,000 |  |  |  |
Royalty on Net Sales, Percentage |  |  |  |  |  |  |  | 2.50% | 5.00%
Director of Clinical Affairs [Member] |  |  |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities, Current |  |  |  |  |  |  | $ 114,000 |  |
Interim Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Royalty on Net Sales, Percentage |  |  |  |  |  |  |  | 2.50% |
Manufacturing Agreement for Handpieces [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  | 423,000 | $ 592,000 | 1,200,000 | $ 1,300,000 |  |  |
Manufacturing Agreement for Handpieces [Member] | Related Party [Member] | Accounts Payable, Related Parties, Current [Member] |  |  |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities |  |  | 803,000 |  | 803,000 |  | $ 402,000 |  |
Purchased Medical Products [Member] | University Pain Medicine Center (STEMMEE) [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 6,000 |  | $ 9,000 |  |  |  |

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