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Note 10 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jul. 10, 2017
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 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     $ 104,000   $ 104,000 $ 120,000
Royalty Expense   $ 104,000 108,000 $ 370,000 322,000  
Professional Fees   39,000 39,000 117,000 117,000  
Manufacturing Agreement for Handpieces [Member]            
Related Party Transaction, Purchases from Related Party   636,000 658,000 1,900,000 2,300,000  
Manufacturing Agreement for Handpieces [Member] | Related Party [Member]            
Accounts Payable and Accrued Liabilities, Current   630,000   630,000   $ 819,000
Consulting Services [Member]            
Costs and Expenses, Related Party     25,000   75,000  
Managing Director, China Operations [Member]            
Deferred Compensation Arrangement with Individual, Compensation Expense   50,000 50,000 150,000 150,000  
Consultant [Member]            
Deferred Compensation Arrangement with Individual, Compensation Expense   $ 50,000 $ 50,000 $ 150,000 $ 150,000