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Note 6 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2025
Outstanding, shares (in shares) 1,106,436
Outstanding, weighted average exercise price (in dollars per share) $ 7.15
Granted, shares (in shares) 0
Granted, weighted average exercise price (in dollars per share) $ 0
Exercised, shares (in shares) (9,367)
Exercised, weighted average exercise price (in dollars per share) $ 6.52
Forfeited or expired, shares (in shares) (99,005)
Forfeited or expired, weighted average exercise price (in dollars per share) $ 9.26
Outstanding, shares (in shares) 998,064
Outstanding, weighted average exercise price (in dollars per share) $ 6.95
Outstanding- weighted average remaining contractual term (Year) 4 years 4 months 2 days
Outstanding- aggregate intrinsic value $ 2,025
Vested and expected to vest, shares (in shares) 900,507
Vested and expected, weighted average exercise price (in dollars per share) $ 6.94
Vested and expected to vest, weighted average remaining contractual term (Year) 4 years 2 months 12 days
Vested and expected to vest, aggregate intrinsic value $ 1,835
Exercisable, shares (in shares) 540,052
Exercisable, weighted average exercise price (in dollars per share) $ 6.77
Exercisable- weighted average remaining contractual term (Year) 3 years 1 month 2 days
Exercisable- aggregate intrinsic value $ 1,192