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Note 16 - Stockholders' Equity (Tables)
 9 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
Accumulated
   
 
 
 
   
 
 
 
  
 
 
 
  
Additional
    
 
 
 
  
Other
    
Total
  
   
Common Stock
    
Paid-in
    
Accumulated
   
Comprehensive
    
Stockholders'
  
   
Shares
    
Amount
    
Capital
    
Deficit
    
Loss
    
Equity
  
Balance at September 30, 2019
    
32,949,987
     $
330
     $
89,571,641
     $
(53,731,903
 )   $
(458,719
 )   $
35,381,349
  
Share-based compensation expense
    
-
      
-
      
158,327
      
-
      
-
      
158,327
  
Issuance of common stock upon exercise of stock options, net
    
83,343
      
1
      
144,213
      
-
      
-
      
144,214
  
Other comprehensive income
    
-
      
-
      
-
      
-
      
85,314
      
85,314
  
Net income
    
-
      
-
      
-
      
620,327
      
-
      
620,327
  
Balance at December 31, 2019
    
33,033,330
     $
331
     $
89,874,181
     $
(53,111,576
 )   $
(373,405
 )   $
36,389,531
  
                                                 
Share-based compensation expense
    
-
      
-
      
295,290
      
-
      
-
      
295,290
  
Issuance of common stock upon exercise of stock options, net
    
56,861
      
-
      
113,833
      
-
      
-
      
113,833
  
Issuance of common stock upon vesting of restricted stock units
    
198,106
      
2
      
(2
 )    
-
      
-
      
-
  
Shares retained for payment of taxes in connection with net share settlement of restricted stock units
    
(13,063
 )    
-
      
(41,410
 )    
-
      
-
      
(41,410
 )
Stock buyback
    
(156,505
 )    
(2
 )    
(398,254
 )    
 
      
 
      
(398,256
 )
Other comprehensive loss
    
-
      
-
      
-
      
-
      
(69,352
 )    
(69,352
 )
Net income
    
-
      
-
      
-
      
301,575
      
-
      
301,575
  
Balance at March 31, 2020
    
33,118,729
     $
331
     $
89,843,638
     $
(52,810,001
 )   $
(442,757
 )   $
36,591,211
  
                                                 
Share-based compensation expense
    
-
      
-
      
322,025
      
-
      
-
      
322,025
  
Issuance of common stock upon exercise of stock options, net
    
371,815
      
4
      
738,840
      
-
      
-
      
738,844
  
Other comprehensive income
    
-
      
-
      
-
      
-
      
51,274
      
51,274
  
Net income
    
-
      
-
      
-
      
1,504,077
      
-
      
1,504,077
  
Balance at June 30, 2020
    
33,490,544
     $
335
     $
90,904,503
     $
(51,305,924
 )   $
(391,483
 )   $
39,207,431
  
   
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
Accumulated
   
 
 
 
   
 
 
 
  
 
 
 
  
Additional
    
 
 
 
  
Other
    
Total
  
   
Common Stock
    
Paid-in
    
Accumulated
   
Comprehensive
    
Stockholders'
  
   
Shares
    
Amount
    
Capital
    
Deficit
    
Loss
    
Equity
  
Balance at September 30, 2018
    
33,176,146
     $
332
     $
90,251,145
     $
(56,516,895
 )   $
(245,375
 )   $
33,489,207
  
Share-based compensation expense
    
-
      
-
      
133,845
      
-
      
-
      
133,845
  
Issuance of common stock upon exercise of stock options, net
    
1,600
      
-
      
2,528
      
-
      
-
      
2,528
  
Stock buyback
    
(588,425
 )    
(6
 )    
(1,621,016
 )    
-
      
-
      
(1,621,022
 )
Other comprehensive loss
    
-
      
-
      
-
      
-
      
(54,335
 )    
(54,335
 )
Net income
    
-
      
-
      
-
      
1,045,940
      
-
      
1,045,940
  
Balance at December 31, 2018
    
32,589,321
     $
326
     $
88,766,502
     $
(55,470,955
 )   $
(299,710
 )   $
32,996,163
  
                                                 
Share-based compensation expense
    
-
      
-
      
171,977
      
-
    
 
-
      
171,977
  
Issuance of common stock upon exercise of stock options, net
    
26,682
      
-
      
42,644
      
-
    
 
-
      
42,644
  
Issuance of common stock upon vesting of restricted stock units
    
156,115
      
2
      
(2
 )    
-
    
 
-
      
-
  
Stock buyback
    
(200,000
 )    
(2
 )    
(549,998
 )    
-
      
 
      
(550,000
 )
Other comprehensive loss
    
-
      
-
      
-
      
-
      
(69,091
 )    
(69,091
 )
Net income
    
-
      
-
      
-
      
1,178,850
    
 
-
      
1,178,850
  
Balance at March 31, 2019
    
32,572,118
     $
326
     $
88,431,123
     $
(54,292,105
 )   $
(368,801
 )   $
33,770,543
  
                                                 
Share-based compensation expense
    
-
      
-
      
257,566
      
-
      
-
      
257,566
  
Issuance of common stock upon exercise of stock options, net
    
7,000
      
-
      
9,449
      
-
      
-
      
9,449
  
Other comprehensive loss
    
-
      
-
      
-
      
-
      
56,538
      
56,538
  
Net income
    
-
      
-
      
-
      
638,041
      
-
      
638,041
  
Balance at June 30, 2019
    
32,579,118
     $
326
     $
88,698,138
     $
(53,654,064
 )   $
(312,263
 )   $
34,732,137