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Note 4 - Balance Sheet Components - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Compensation expense $ 3,199 $ 1,377  
Director and officer liability insurance (Note 12) 0 571  
Clinical trial fees and costs 84 64  
Professional fees 343 318  
Warranty 0 50 $ 80
Other 188 215  
Accrued Liabilities, Current $ 3,814 $ 2,595