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Note 9 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued compensation $ 365 $ 417
Accrued clinical study costs 255 292
Accrued research and other professional fees 33 65
Accrued taxes and other liabilities 33 34
Total accrued liabilities $ 686 $ 808