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Note 4 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

Options Outstanding and Exercisable:

                         

Range of
Exercise Price

 

Number
Outstanding

   

Wgt. Avg. Contractual
Life Remaining (in

years)

   

Wgt. Avg.
Exercise Price

   

Aggregate
Intrinsic Value

 
$3.50 - $3.86     13,000       3.7     $ 3.75     $ 280,940  
$7.80     8,000       4.9     $ 7.80     $ 140,480  
$19.99     30,000       5.6     $ 19.99     $ 161,100  
$39.11     8,000       5.9     $ 39.11     $ --  
$3.50 - $39.11     59,000       5.1     $ 17.35     $ 582,520