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Note 5 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Stock-based compensation expense $ 159 $ 154 $ 320 $ 293
Share-Based Payment Arrangement, Option [Member]        
Stock-based compensation expense 152 153 308 291
Restricted Stock [Member]        
Stock-based compensation expense $ 7 $ 1 $ 12 $ 2