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Note 10 - Stockholders' Equity - Stock-Based Compensation Expense Including Options and Restricted Stock by Category (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Allocated share-based compensation expense $ 265 $ 586
Cost of Sales [Member]    
Allocated share-based compensation expense 1 1
Engineering and Product Development [Member]    
Allocated share-based compensation expense 56 73
Selling and Marketing Expense [Member]    
Allocated share-based compensation expense 62 131
General and Administrative Expense [Member]    
Allocated share-based compensation expense $ 146 $ 381