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Note 3 - Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, plant, and equipment, gross $ 399 $ 390
Less: accumulated depreciation (196) (181)
Property and equipment, net 203 209
Office Equipment [Member]    
Property, plant, and equipment, gross 161 150
Laboratory Equipment [Member]    
Property, plant, and equipment, gross 113 114
Automobiles [Member]    
Property, plant, and equipment, gross 22 23
Leasehold Improvements [Member]    
Property, plant, and equipment, gross $ 103 $ 103