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Note 3 - Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
 
 
 
  
March 31, 2020
    
December 31, 2019
  
Financial Assets:
  
Level
    
Carrying Value
    
Fair Value
    
Carrying Value
    
Fair Value
  
                                         
Cash and cash equivalents
    
1
     $
2,867,156
     $
2,867,156
     $
3,280,289
     $
3,280,289
  
Certificate of deposit - short term
    
1
      
3,163,163
      
3,163,163
      
2,697,000
      
2,697,000
  
Equity investment in mutual funds
    
1
      
502,387
      
499,610
      
500,410
      
500,642
  
Total
    
 
     $
6,532,706
     $
6,529,929
     $
6,477,699
     $
6,477,931