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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Investment [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Certificates of deposit
  $
987,599
    $
1,378,666
 
Corporate bonds available for sale    
910,000
     
-
 
U.S. Treasury notes and corporate bond held to maturity
   
4,649,572
     
4,872,398
 
                 
Total
  $
6,547,171
    $
6,251,064
 
   
December 31,
 
   
2019
   
2018
 
                 
U.S. Treasury securities, held to maturity
  $
1,094,983
    $
2,902,004
 
Certificates of deposit
   
380,753
     
317,178
 
Preferred stock
   
104,019
     
104,019
 
Non-voting preferred units of Dream Finders Holdings, LLC    
12,000,000
     
-
 
Non-voting common units of Dream Finders Holdings, LLC
   
10,000,000
     
10,000,000
 
Voting common stock of CB&T Holding Corporation
   
19,058,485
     
19,058,485
 
                 
Total
  $
42,638,240
    $
32,381,686
 
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]
     
 
 
 
Gross
     
 
 
     
 
 
 
Unrealized
   
Fair
 
   
Cost
   
Gain (Loss)
   
Value
 
                         
Marketable equity securities, December 31, 2019
  $
49,554,926
    $
6,353,001
    $
55,907,927
 
                         
Marketable equity securities, December 31, 2018
  $
-
    $
-
    $
-
 
 
U.S. Treasury Securities Available for Sale
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
     
 
 
 
Gross
     
 
 
     
 
 
 
Unrealized
   
Fair
 
   
Cost
   
Gain
   
Value
 
                         
U.S. Treasury notes, December 31, 2019
  $
75,488,863
    $
(79,664
)   $
75,409,199
 
                         
U.S. Treasury notes, December 31, 2018   $
86,728,590
    $
116,796
    $
86,845,386
 
Investments in and Advances to Affiliates [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Beginning of year
  $
568,713
    $
952,128
 
Additional investment in unconsolidated affiliates
   
264,834
     
40,399
 
Distributions received
   
(541,108
)    
(816,201
)
Loss on investment in affiliate
   
-
     
(107,630
)
Equity in income of unconsolidated affiliates
   
479,366
     
500,017
 
                 
End of year
  $
771,805
    $
568,713
 
Equity Method Investments [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Revenue
  $
19,374,109
    $
16,529,997
 
Gross profit
   
6,731,623
     
7,579,760
 
Income from continuing operations
   
1,806,620
     
3,184,701
 
Net income
   
1,859,438
     
3,138,320