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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule Of Valuation and Qualifying Accounts [Table Text Block]
              Additions                  
Description    
Balance at
Beginning
of Period
      
Charged to
Costs and
Expenses
      
Charged
to Other
Accounts
       Deductions      
Balance at
End of Period
  
Deducted from Asset Accounts:                                        
                                         
Year Ended September 30, 2017
  
Reserve for doubtful accounts
 
$
10,000
 
 
$
275
(1)
 
$
 
 
(2)
 
 
$
-
 
(3)
 
$
10,275
 
Reserve for inventory obsolescence
 
$
235,592
 
 
$
284,352
(5)
 
$
-
 
 
$
(46,692
) 
(4)
 
$
473,252
 
Reserve for product warranty
 
$
-
 
 
$
 
 
 
$
-
 
 
$
 
 
 
$
0
 
Valuation allowance for deferred taxes
 
$
500,000
 
 
$
-
 
 
$
-
 
 
$
-
 
 
$
500,000
 
Year Ended December
31, 201
8
 
Reserve for doubtful accounts
 
$
60,275
 
 
$
-
 
(1)
 
 
$
- 
 
(2)
 
 
$
(25,275
)
(3)
 
 
$
35,000
 
Reserve for inventory obsolescence
 
$
473,252
 
 
$
56,261
 (5)
 
$
(303,201
) 
 
$
(72,008
) 
(4)
 
$
226,492
 
Reserve for product warranty
 
$
199,899
 
 
$
419,460
 
 
$
-
 
 
$
(145,055
)
 
$
474,304
 
Valuation allowance for deferred taxes
 
$
47,319
 
 
$
-
 
 
$
-
 
 
$
-
 
 
$
47,319
 
Reserve for uncertain tax positions
 
$
395,000
 
 
$
-
 
 
$
-
 
 
$
-
 
 
$
395,000