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Note 4 - Supplemental Balance Sheet Information (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Restricted Cash and Cash Equivalents $ 0   $ 82
Depreciation 740 $ 762  
Amortization of Intangible Assets 228 209  
Selling, General and Administrative Expenses [Member]      
Amortization of Intangible Assets 203 185  
Research and Development Expense [Member]      
Amortization of Intangible Assets 25 $ 24  
NETHERLANDS      
Restricted Cash and Cash Equivalents $ 82