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Note 8 - Cash Equivalents and Marketable Securities (Tables)
 9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
        Gross Unrealized   Estimated
    Cost   Gains   Losses   Fair Value
                                 
Money market mutual funds   $
1,015,102
     $
-
     $
-
     $
1,015,102
  
        Gross Unrealized   Estimated
    Cost   Gains   Losses   Fair Value
                                 
Money market mutual funds   $
851,195
     $
-
     $
-
     $
851,195
  
Debt Securities, Held-to-maturity [Table Text Block]
 
 
Cost
 
Accrued
Interest
 
Amortization
Bond Premium
 
Amortized
Cost
 
Unrealized
Gains
 
Estimated
Fair Value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
 
$
412,366
 
 
$
6,986
 
 
$
59,099
 
 
$
360,253
 
 
$
216
 
 
$
360,469