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Note 6 - Stock-Based Compensation (Tables)
6 Months Ended
Jun. 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       4.7     $ 3.75     $ 298,720  
  $7.80           8,000       5.9     $ 7.80     $ 102,750  
  $19.99           30,000       6.6     $ 19.99     $ 132,600  
  $39.11           8,000       6.9     $ 39.11     $ --  
  $3.50 - $39.11       59,000       6.1     $ 17.35     $ 534,070