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Note 8 - Investments in U.S. Treasury Notes and Bills and Marketable Securities (Tables)
3 Months Ended
Dec. 31, 2012
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
December 31, 2012
   
September 30, 2012
 
   
(Unaudited)
                   
   
Aggregate
fair value
   
Amortized/Adjusted
cost basis
   
Pretax
unrealized
gains
   
Aggregate
fair value
   
Amortized/Adjusted
cost basis
   
Pretax
unrealized
gains
 
U.S. Treasury Bills
  $ ---     $ ---     $ ---     $ 800,000     $ 800,000     $ ---  
Marketable securities
                                               
Common stocks
    105,888,000       44,761,000       61,127,000       94,061,000       44,761,000       49,300,000  
Bonds
    8,232,000       4,932,000       3,300,000       8,095,000       4,931,000       3,164,000  
Total
  $ 114,120,000     $ 49,693,000     $ 64,427,000     $ 102,956,000     $ 50,492,000     $ 52,464,000