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Note 4 - Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
 
 
 
  
March 31, 2019
    
December 31, 2018
  
Financial Assets:
  
Level
    
Carrying Value
    
Fair Value
    
Carrying Value
    
Fair Value
  
                                         
Cash and cash equivalents
    
1
     $
2,022,558
     $
2,022,558
     $
1,860,736
     $
1,860,736
  
Certificate of deposit - short term
    
1
      
3,394,000
      
3,394,000
      
3,370,000
      
3,370,000
  
Certificate of deposit - long term
    
1
      
480,000
      
480,000
      
725,000
      
725,000
  
Equity investment in mutual funds
    
1
      
246,289
      
246,528
      
244,832
      
244,825
  
Total
    
 
     $
6,142,847
     $
6,143,086
     $
6,200,568
     $
6,200,561