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Note 6 - Investments in Marketable Securities (Tables)
 6 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
March 31, 2018
    
September 30, 2017
  
   
(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
   $
217,803,000
     $
58,449,000
     $
159,354,000
     $
220,973,000
     $
58,449,000
     $
162,524,000
  
Bonds
    
---
      
---
      
---
      
8,292,000
      
4,944,000
      
3,348,000
  
    $
217,803,000
     $
58,449,000
     $
159,354,000
     $
229,265,000
     $
63,393,000
     $
165,872,000