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Note 7 - Prepaid Expenses and Other Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Other Assets [Table Text Block]
    December 31,     December 31,  
    2019     2018  
             
Prepaid expenses   $
42,826
     $
31,977
  
Advisor loans receivable    
18,448
      
16,681
  
Investment in equity securities    
10,788
      
6,936
  
Held-to-maturity debt securities    
1,862
      
1,977
  
Deferred Purchase Price    
69,873
      
-
  
Other    
1,374
      
4,903
  
                 
Prepaid and other assets (Current Assets)   $
145,171
     $
62,474
  
                 
Advisor loans receivable   $
48,283
     $
46,661
  
Equity method investments    
5,926
      
3,968
  
Investment in equity securities    
5,565
      
3,800
  
Held-to-maturity debt securities    
4,189
      
3,017
  
Financing fees, net of accumulated amortization of $3,632 (December 31, 2018 - $2,567)    
4,469
      
4,230
  
Interest rate swap asset    
-
      
926
  
Other    
1,078
      
1,128
  
                 
Other assets (Non-Current Assets)   $
69,510
     $
63,730