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Note 4 - Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
 
 
 
  
2018
    
2017
  
Financial Assets:
  
Level
    
Carrying 
Value
    
Fair Value
    
Carrying V
alue
    
Fair Value
  
                                         
Cash and cash equivalents
    
1
     $
1,860,736
     $
1,860,736
     $
1,618,583
     $
1,618,583
  
Certificate of deposit - short term
    
1
      
3,370,000
      
3,370,000
      
2,662,890
      
2,662,890
  
Certificate of deposit - long term
    
1
      
725,000
      
725,000
      
950,000
      
950,000
  
Total
    
 
     $
5,955,736
     $
5,955,736
     $
5,231,473
     $
5,231,473