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Note 5 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Stock options $ 528 $ 776
Share-Based Payment Arrangement, Option [Member]    
Stock options 522 761
Restricted Stock [Member]    
Stock options $ 6 $ 15