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Note 10 - Stock Plans - Summary of SSARs (Details) - Stock Settled Stock Appreciation Rights SSARs [Member] - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Outstanding, awards (in shares) 94,332 97,264 97,264  
Outstanding, weighted average grant date fair value (in dollars per share) $ 9.66 $ 9.47 $ 9.47  
Outstanding, weighted average remaining contractual term (Year) 4 years 6 months 5 years 6 months 6 years 6 months 7 years 6 months
Granted, awards (in shares) 0 0 0  
Exercised, awards (in shares) (3,608) (2,932) 0  
Forfeited, awards (in shares) (3,591) 0 0  
Exercised, weighted average grant date fair value (in dollars per share) $ 4.20 $ 3.48    
Forfeited, weighted average grant date fair value (in dollars per share) $ 14.41      
Outstanding, awards (in shares) 87,133 94,332 97,264 97,264
Outstanding, weighted average grant date fair value (in dollars per share) $ 9.69 $ 9.66 $ 9.47 $ 9.47