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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Investment [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
Certificates of deposit
  $
1,263,273
    $
987,599
 
Corporate bonds available for sale    
600,000
     
910,000
 
U.S. Treasury notes and corporate bond
   
4,834,947
     
4,649,572
 
                 
Total
  $
6,698,220
    $
6,547,171
 
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
U.S. Treasury securities, held to maturity
  $
538,305
    $
1,094,983
 
Certificates of deposit
   
106,216
     
380,753
 
Preferred stock
   
104,019
     
104,019
 
Non-voting preferred units of Dream Finders Holdings, LLC    
6,000,000
     
12,000,000
 
Non-voting common units of Dream Finders Holdings, LLC
   
-
     
10,000,000
 
Voting common stock of CBT Holding Corporation
   
19,058,485
     
19,058,485
 
                 
Total
  $
25,807,025
    $
42,638,240
 
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]
     
 
 
 
Gross
     
 
 
     
 
 
 
Unrealized
   
Fair
 
   
Cost
   
Gain (Loss)
   
Value
 
                         
Marketable equity securities, March 31, 2020
  $
77,700,618
    $
(18,064,904
)   $
59,635,714
 
                         
Marketable equity securities, December 31, 2019   $
49,554,926
    $
6,353,001
    $
55,907,927
 
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
     
 
 
 
Gross
     
 
 
     
 
 
 
Unrealized
   
Fair
 
   
Cost
   
Gain (Loss)
   
Value
 
                         
U.S. Treasury securities, March 31, 2020
  $
-
    $
-
    $
-
 
                         
U.S. Treasury securities, December 31, 2019
  $
75,488,863
    $
(79,664
)   $
75,409,199
 
Investments in and Advances to Affiliates [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
Beginning of period
  $
771,805
    $
568,713
 
Additional investment in unconsolidated affiliates
   
11,500,000
     
264,834
 
Distributions received
   
(98,100
)    
(541,108
)
Equity in income of unconsolidated affiliates
   
465,665
     
479,366
 
                 
End of period
  $
12,639,370
    $
771,805
 
Equity Method Investments [Table Text Block]
   
March 31,
 
   
2020
   
2019
 
                 
Revenue
  $
191,751,459
    $
119,274,082
 
Gross profit
   
25,787,988
     
21,798,609
 
Income from continuing operations
   
7,382,036
     
3,537,480
 
Net income
   
6,517,748
     
3,348,507