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Note 8 - Stock-based Compensation Expense - Changes in Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Vested (in shares) (120,000)  
Restricted Stock Units (RSUs) [Member]    
Outstanding (in shares) 36,000 6,000
Outstanding, grant date weighted average fair value (in dollars per share) $ 2.88 $ 2.33
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 290,000 146,000
Granted, grant date weighted average fair value (in dollars per share) $ 3.09 $ 2.97
Vested (in shares) (120,000) (116,000)
Vested, grant date weighted average fair value (in dollars per share) $ 2.93 $ 2.94
Outstanding (in shares) 206,000 36,000
Outstanding, grant date weighted average fair value (in dollars per share) $ 3.07 $ 2.88