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Note 2 - Investments in Debt and Equity Securities (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Gain (Loss) on Securities [Table Text Block]
   
Three Months Ended
December 31, 2019
    
Three Months Ended
December 31, 2018
  
Net gains and (losses) recognized during the period on equity securities
   $
10,000
     $
(29,000
 )
                 
Less: Net gains and (losses) recognized during the period on equity securities sold during the period
    
–
      
–
  
                 
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date
   $
10,000
     $
(29,000
 )
Available-for-sale Securities [Table Text Block]
December 31, 2019
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Fair Value
  
Available for sale debt securities
   $
60,418,000
     $
170,000
     $
1,000
     $
60,587,000
  
September 30, 2019
  
Amortized
Cost
    
Unrealized
Gains
    
Unrealized
Losses
    
Fair Value
  
Available for sale debt securities
   $
55,946,000
     $
178,000
     $
1,000
     $
56,123,000