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Note 6 - Investments in Marketable Securities (Tables)
 3 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
December 31, 2017
    
September 30, 2017
  
   
Aggregate
fair value
    
(Unaudited)
Amortized/
Adjusted
cost basis
    
Pretax
unrealized
gains
    
Aggregate
fair value
    
Amortized/
Adjusted
cost basis
    
Pretax
unrealized
gains
  
Marketabl
e securities
                                                
Common stocks
   $
236,387,000
     $
58,449,000
     $
177,938,000
     $
220,973,000
     $
58,449,000
     $
162,524,000
  
Bonds
    
8,547,000
      
4,945,000
      
3,602,000
      
8,292,000
      
4,944,000
      
3,348,000
  
    $
244,934,000
     $
63,394,000
     $
181,540,000
     $
229,265,000
     $
63,393,000
     $
165,872,000