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Note E - Concentrations (Tables)
 12 Months Ended
Sep. 30, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
    Year Ended September 30,
    2019   2018   2017
United States   $
78,553,000
     $
72,295,000
     $
67,901,000
  
All Other Countries    
6,481,000
      
5,356,000
      
6,047,000
  
Total Net Sales   $
85,034,000
     $
77,651,000
     $
73,948,000