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Note 4 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 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       4.0     $ 3.75     $ 342,950  
    $7.80         8,000       5.2     $ 7.80     $ 178,640  
    $19.99         30,000       5.8     $ 19.99     $ 304,200  
    $39.11         8,000       6.2     $ 39.11     $ --  

 

$3.50 - $39.11       59,000       5.4     $ 17.35     $ 825,790