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Note 8 - Stock-based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2024
Balance, number of options outstanding (in shares) 270,500
Balance, option, weighted average exercise price (in dollars per share) $ 3.09
Granted, options (in shares) 0
Granted, option, weighted average exercise price (in dollars per share) $ 0
Exercised, options (in shares) 0
Exercised, option, weighted average exercise price (in dollars per share) $ 0
Expired or forfeited, options (in shares) (94,500)
Expired or forfeited, option, weighted average exercise price (in dollars per share) $ 5.22
Balance, number of options outstanding (in shares) 176,000
Balance, option, weighted average exercise price (in dollars per share) $ 1.94
Outstanding, weighted average remaining contractual term (Year) 1 year 8 months 4 days
Outstanding, aggregate intrinsic value $ 5
Exercisable, options (in shares) 176,000
Exercisable, option, weighted average exercise price (in dollars per share) $ 1.94
Exercisable, weighted average remaining contractual term (Year) 1 year 8 months 4 days
Exercisable, aggregate intrinsic value $ 5