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Note 12 - Stock-based Compensation - Summary of Outstanding Options (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 223,406
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 28.52
Issued (in shares) | shares 0
Issued, weighted average exercise price (in dollars per share) | $ / shares $ 0
Exercised (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Expired/Forfeited (in shares) | shares (1,000)
Expired/Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 15.3
Outstanding (in shares) | shares 222,406
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 28.58
Outstanding, weighted average remaining contractual life (Year) 2 years 2 months 12 days
Outstanding, aggregate intrinsic value | $ $ 1,273,465
Exercisable (in shares) | shares 194,456
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 26.82
Exercisable, weighted average remaining contractual life (Year) 2 years 1 month 6 days
Exercisable, aggregate intrinsic value | $ $ 1,270,798