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Note 5 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

Level 1

  

Level 2

  

Level 3

 

December 31, 2021

            

Money market funds

 $1,600,663  $-  $- 
Fair value of contingent consideration  -   -   930,000 

Total

 $1,600,663  $-  $930,000 
             

December 31, 2020

            

Money market funds

 $1,343,370  $-  $- 

Total

 $1,343,370  $-  $-