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Note 5 - Stockholders' Equity (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 15 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Dec. 01, 2023
Nov. 02, 2023
Stock Repurchased and Retired During Period, Value $ 557 $ 4,301        
Share Repurchase Program [Member]            
Stock Repurchase Program, Authorized Amount           $ 30,000
Rule 10b5-1 Trading Plan, Designated Amount         $ 10,000  
Stock Repurchased and Retired During Period, Shares (in shares) 18,000 145,000 0 0    
Stock Repurchased and Retired During Period, Value $ 600 $ 4,300        
Share Repurchase Program, Remaining Authorized, Amount $ 24,900 $ 24,900   $ 24,900