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Note 7 - Stock Plans - Summary of SSARs (Details) - Stock Settled Stock Appreciation Rights SSARs [Member] - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Outstanding, awards (in shares) 64,326    
Outstanding, weighted average grant date fair value (in dollars per share) $ 11.59    
Outstanding, weighted average remaining contractual term (Year) 3 years 3 months 18 days   3 years 9 months 18 days
Granted, awards (in shares) 0    
Granted, weighted average grant date fair value (in dollars per share)    
Exercised, awards (in shares) 0 (7,665)  
Exercised, weighted average grant date fair value (in dollars per share)    
Forfeited, awards (in shares) 0    
Forfeited, weighted average grant date fair value (in dollars per share)    
Outstanding, awards (in shares) 64,326   64,326
Outstanding, weighted average grant date fair value (in dollars per share) $ 11.59   $ 11.59