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Note 4 - Supplemental Balance Sheet Information (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Restricted Cash and Cash Equivalents $ 81   $ 79
Depreciation 762 $ 816  
Amortization of Intangible Assets 209 328  
Selling, General and Administrative Expenses [Member]      
Amortization of Intangible Assets 185 302  
Research and Development Expense [Member]      
Amortization of Intangible Assets 24 $ 26  
NETHERLANDS      
Restricted Cash and Cash Equivalents $ 81   $ 79