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Note 15 - Stockholders' Equity (Tables)
 6 Months Ended
Mar. 31, 2019
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, 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
  
Issuance of common stock upon vesting of restricted stock units
    
-
      
-
      
-
      
-
      
-
      
-
  
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
    
-
      
-
      
171,975
      
-
      
-
      
171,975
  
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
  
   
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
Accumulated
   
 
 
 
   
 
 
 
  
 
 
 
  
Additional
    
 
 
 
  
Other
    
Total
  
   
Common Stock
 
  
Paid-in
    
Accumulated
   
Comprehensive
    
Stockholders'
  
   
Shares
    
Amount
    
Capital
    
Deficit
    
Loss
    
Equity
  
Balance at September 30, 2017
    
32,158,436
     $
322
     $
87,956,839
     $
(52,771,853
 )   $
(1,269
 )   $
35,184,039
  
Share-based compensation expense
    
-
      
-
      
138,461
      
-
      
 
      
138,461
  
Issuance of common stock upon exercise of stock options, net
    
90,852
      
-
      
159,518
      
-
      
-
      
159,518
  
Issuance of common stock upon vesting of restricted stock units
    
-
      
-
      
-
      
-
      
-
      
-
  
Stock buyback
    
-
      
-
      
-
      
-
      
-
      
-
  
Other comprehensive loss
    
-
      
-
      
-
      
-
      
(8,031
 )    
(8,031
 )
Net income
    
-
      
-
      
-
      
(1,683,252
 )    
-
      
(1,683,252
 )
Balance at December 31, 2017
    
32,249,288
     $
322
     $
88,254,818
     $
(54,455,105
 )   $
(9,300
 )   $
33,790,735
  
                                                 
Share-based compensation expense
    
-
      
-
      
145,789
      
-
      
-
      
145,789
  
Issuance of common stock upon exercise of stock options, net
    
20,000
      
-
      
26,200
      
-
      
-
      
26,200
  
Issuance of common stock upon vesting of restricted stock units
    
125,000
      
-
      
-
      
-
      
-
      
-
  
Stock buyback
    
-
      
-
      
-
      
 
      
 
      
-
  
Other comprehensive loss
    
-
      
-
      
-
      
-
      
(4,482
 )    
(4,482
 )
Net income
    
-
      
-
      
-
      
460,908
      
-
      
460,908
  
Balance at March 31, 2018
    
32,394,288
     $
322
     $
88,426,807
     $
(53,994,197
 )   $
(13,782
 )   $
34,419,150