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Note 6 - Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
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       4.5     $ 3.75     $ 256,480  
    $7.80         8,000       5.7     $ 7.80     $ 89,550  
    $19.99         30,000       6.3     $ 19.99     $ 53,400  
    $39.11         8,000       6.7     $ 39.11     $  

$3.50

- $39.11       59,000       5.9     $ 17.35     $ 399,430