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Note 5 - Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Carrying
    
Fair
                          
Description
  
Amount
    
Value
    
Level 1
    
Level 2
    
Level 3
  
                                         
September 30, 2019
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revolving line of credit
   $
500,000
     $
500,000
      
-
     $
500,000
      
-
  
Note receivable - distributor
    
1,313,526
      
1,430,000
      
-
      
1,430,000
      
-
  
Notes receivable - Nutracom
    
1,224,927
      
1,224,927
      
-
      
1,224,927
      
-
  
Marketable securities
    
415,000
      
415,000
     $
415,000
      
-
      
-
  
                                         
December 31, 2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Note receivable - distributor
   $
1,405,112
     $
1,529,000
      
-
     $
1,529,000
      
-
  
Marketable securities
    
339,000
      
339,000
     $
339,000
      
-
      
-