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Note 10 - Related Party Transactions (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 10, 2017 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
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 |  |  |  |  |  |
Director of Clinical Affairs [Member] |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities, Current |  | $ 145,000 |  |  | $ 145,000 |  | $ 120,000
Royalty Expense |  | 144,000 |  | $ 81,000 | 267,000 | $ 213,000 |
Professional Fees |  | 39,000 |  | 39,000 | 78,000 | 78,000 |
Manufacturing Agreement for Handpieces [Member] |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  | 592,000 |  | 436,000 | 1,300,000 | 1,700,000 |
Manufacturing Agreement for Handpieces [Member] | Related Party [Member] |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities, Current |  | 592,000 |  |  | 592,000 |  | $ 819,000
Consulting Services [Member] |  |  |  |  |  |  |
Costs and Expenses, Related Party |  | 25,000 |  |  | 50,000 |  |
Managing Director, China Operations [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  | $ 50,000 | 50,000 | 100,000 | 100,000 |
Consultant [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | $ 50,000 |  | $ 50,000 | $ 100,000 | $ 100,000 |

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483581/946-220-45-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
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