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Note 6 - Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Gain (Loss) on Securities [Table Text Block]
    THREE MONTHS
ENDED
JUNE 30,		   SIX MONTHS
ENDED
JUNE 30,
    2019   2018   2019   2018
Net gains (losses) recognized during the period on marketable securities   $
86,849
     $
(18,256
 )   $
344,043
      
(153,406
 )
Less: Net (losses) gains recognized during the period on marketable securities sold during the period    
(252,728
 )    
113,276
      
(247,499
 )    
113,276
  
Unrealized (losses) gains recognized during the reporting period on marketable securities still held at the reporting date   $
(165,879
 )   $
95,020
     $
96,544
      
(40,130
 )
Marketable Securities [Table Text Block]
June 30, 2019
(Unaudited)
            
Debt Securities
   Cost   Fair value   Unrealized
gain
U.S Treasury Bills (maturities of one year or less)   $
4,703,762
     $
4,703,762
     $
—
  
Total debt securities    
4,703,762
      
4,703,762
      
—
  
                         
Equity Securities
                        
Fixed income mutual funds    
2,037,031
      
2,182,337
      
145,306
  
Equity and other mutual funds    
601,980
      
805,781
      
203,801
  
Total equity securities    
2,639,011
      
2,988,118
      
349,107
  
Total marketable securities   $
7,342,773
     $
7,691,880
     $
349,107
  
December 31, 2018
(Audited)
           
             
Debt Securities
                        
U.S Treasury Bills (maturities of one year or less)   $
3,742,681
     $
3,742,681
     $
—
  
Total debt securities    
3,742,681
      
3,742,681
      
—
  
                         
Equity Securities
                        
Fixed income mutual funds    
2,408,799
      
2,409,213
      
414
  
Equity and other mutual funds    
1,218,153
      
1,470,302
      
252,149
  
Total equity securities    
3,626,952
      
3,879,515
      
252,563
  
Total marketable securities
   $
7,369,633
     $
7,622,196
     $
252,563