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Note 4 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
 
 
 
 
June 30, 2019
   
December 31, 2018
 
Financial Assets:
 
Level
   
Carrying Value
   
Fair Value
   
Carrying Value
   
Fair Value
 
                                         
Cash and cash equivalents
   
1
    $
2,484,361
    $
2,484,361
    $
1,860,736
    $
1,860,736
 
Certificate of deposit - short term
   
1
     
3,164,000
     
3,164,000
     
3,370,000
     
3,370,000
 
Certificate of deposit - long term
   
1
     
240,000
     
240,000
     
725,000
     
725,000
 
Equity investment in mutual funds
   
1
     
247,793
     
248,032
     
244,832
     
244,825
 
Total
   
 
    $
6,136,154
    $
6,136,393
    $
6,200,568
    $
6,200,561