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Note 3 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
 
 
 
 
June 30, 2020
   
December 31, 2019
 
Financial Assets:
 
Level
   
Carrying Value
   
Fair Value
   
Carrying Value
   
Fair Value
 
                                         
Cash and cash equivalents
   
1
    $
3,567,149
    $
3,567,149
    $
3,280,289
    $
3,280,289
 
Certificate of deposit - short term
   
1
     
2,753,465
     
2,758,705
     
2,697,000
     
2,697,000
 
Equity investment in mutual funds
   
1
     
503,584
     
502,314
     
500,410
     
500,642
 
Total
   
 
    $
6,824,198
    $
6,828,168
    $
6,477,699
    $
6,477,931