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Note 17 - Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Fiscal year ended 201
9
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Sales
   $
6,810,097
     $
12,889,939
     $
17,559,315
     $
17,858,946
  
Gross profit
   $
1,723,389
     $
2,272,035
     $
3,310,635
     $
1,786,463
  
Loss from continuing operations
   $
(1,203,311
 )   $
(1,211,158
 )   $
(58,196
 )   $
(1,562,434
 )
Basic loss from continuing operations per common share
   $
(0.12
 )   $
(0.12
 )   $
(0.00
 )   $
(0.15
 )
Diluted loss from continuing operations per common share
   $
(0.12
 )   $
(0.12
 )   $
(0.00
 )   $
(0.15
 )
                                 
Fiscal year ended 201
8
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Sales
   $
6,458,360
     $
7,004,431
     $
7,674,997
     $
6,335,494
  
Gross profit
   $
2,180,028
     $
1,805,683
     $
1,993,351
     $
1,438,153
  
Loss from continuing operations
   $
(886,775
 )   $
(761,380
 )   $
(348,713
 )   $
(3,786,829
 )
Basic loss from continuing operations per common share
   $
(0.09
 )   $
(0.07
 )   $
(0.03
 )   $
(0.37
 )
Diluted loss from continuing operations per common share
   $
(0.09
 )   $
(0.07
 )   $
(0.03
 )   $
(0.37
 )
                                 
Fiscal year ended 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Sales
   $
5,521,002
     $
6,297,791
     $
6,952,487
     $
7,136,291
  
Gross profit
   $
1,623,287
     $
2,009,370
     $
1,881,439
     $
1,558,142
  
Loss from continuing operations
   $
(598,562
 )   $
(418,360
 )   $
(565,985
 )   $
(872,838
 )
Basic loss from continuing operations per common share
   $
(0.06
 )   $
(0.04
 )   $
(0.06
 )   $
(0.08
 )
Diluted loss from continuing operations per common share
   $
(0.06
 )   $
(0.04
 )   $
(0.06
 )   $
(0.08
 )