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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