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Note 4 - Property and Equipment and Building Construction in Progress - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accumulated depreciation $ (15,731) $ (13,111)
Property, Plant and Equipment, Including Building Construction in Process 28,308 27,336
Office Equipment [Member]    
Property, plant, and equipment, gross 557 557
Furniture and Fixtures [Member]    
Property, plant, and equipment, gross 130 130
Land [Member]    
Property, plant, and equipment, gross 1,418 1,418
Scientific Equipment [Member]    
Property, plant, and equipment, gross 16,829 14,433
Vehicles [Member]    
Property, plant, and equipment, gross 82 82
Building [Member]    
Property, plant, and equipment, gross 22,773 21,013
Mobile Facility [Member]    
Property, plant, and equipment, gross 189 189
Construction in Progress [Member]    
Property, plant, and equipment, gross $ 2,061 $ 2,625