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Note 4 - Balance Sheet Components - Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Compensation expense $ 1,615 $ 1,377    
Director and officer liability insurance (Note 12) 815 571    
Clinical trial fees and costs 49 64    
Professional fees 351 318    
Warranty 50 50 $ 97 $ 80
Other 211 215    
Accrued Liabilities, Current $ 3,091 $ 2,595