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Note 2 - Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Gross property and equipment $ 972 $ 658
Less: accumulated depreciation and amortization (473) (457)
Net property and equipment 499 201
Equipment [Member]    
Gross property and equipment 334 138
Leasehold Improvements [Member]    
Gross property and equipment 298 197
Furniture and Fixtures [Member]    
Gross property and equipment 205 199
Property, Plant and Equipment, Other Types [Member]    
Gross property and equipment $ 135 $ 124