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Note 5 - Goodwill (Tables)
 12 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Brokerage and Advisory Services
    
Tax and Accounting Services
    
Total
  
                         
Balance as of September 30, 2018
   $
4,451,000
     $
702,000
     $
5,153,000
  
Impairment
    
—
      
—
      
—
  
Balance as of September 30, 2019
   $
4,451,000
     $
702,000
     $
5,153,000
  
Goodwill related to Winslow acquisition    
2,680,000
      
—
      
2,680,000
  
Goodwill related to UA acquisition    
4,803,000
      
—
      
4,803,000
  
Reduction related to sale of National Tax branches    
(164,000
 )    
(75,000
 )    
(239,000
 )
Impairment    
(724,000
 )    
—
      
(724,000
 )
Balance as of September 30, 2020
   $
11,046,000
     $
627,000
     $
11,673,000