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Note 7 - Investments in Marketable Securities (Tables)
 9 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
June 30, 2017
   
September 30, 2016
  
   
(Unaudited)
                          
   
 
Aggregate
fair value
    
Amortized/
Adjusted
cost basis
    
Pretax
unrealized
gains
   
 
Aggregate
fair value
    
Amortized/
Adjusted
cost basis
    
Pretax
unrealized
gains
 
Marketable securities
                                                
Common stocks
   $
202,149,000
     $
58,449,000
     $
143,700,000
     $
158,462,000
     $
53,436,000
     $
105,026,000
  
Bonds
    
8,404,000
      
4,943,000
      
3,461,000
      
8,172,000
      
4,942,000
      
3,230,000
  
    $
210,553,000
     $
63,392,000
     $
147,161,000
     $
166,634,000
     $
58,378,000
     $
108,256,000