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Stock-based compensation plans (Tables)
 3 Months Ended
Dec. 31, 2016
Stock-based compensation plans [Abstract]  
Schedule of weighted average fair value assumptions of stock options
The weighted average input assumptions used and resulting fair values of stock options at December 31, 2016, were as follows:

  
December 31, 2016
 
    
Executive and management options:
   
    
Expected life (in years)
  
4.0
 
Risk-free interest rate
  
1.55
%
Volatility
  
61.43
%
Dividend yield
  
0.00
%
Weighted-average fair value per share
 
$
4.81
 
Executive chairman options:
    
     
Expected life (in years)
  
4.0
 
Risk-free interest rate
  
1.01% - 1.93
%
Volatility
  
60.45% - 64.40
%
Dividend yield
  
0.00
%
Weighted-average fair value per share
 
$
3.56 - $3.80
 
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock activity
A summary of restricted stock and stock option activity, including both performance based awards and time-based awards, for the three month period ended December 31, 2016, is as follows:

  
 
Number of shares of
Restricted Stock
  
Weighted Average
Grant-Date Fair
Value
 
Non-vested balance as of September 30, 2016
  
138,940
  
$
6.50
 
Vested
  
(60,000
)
 
$
6.39
 
Non-vested balance as of December 31, 2016
  
78,940
  
$
6.58
 

  
 
Number of shares of
Stock Options
  
Weighted Average
Grant-Date Fair
Value
 
Non-vested balance as of September 30, 2016
  
50,625
  
$
4.6 7
 
Non-vested balance as of December 31, 2016
  
50,625
  
$
4.67
 
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option activity under employee share option plan
A summary of performance based option activity under the share option plan as of December 31, 2016, and changes during the three months then ended is presented below:
 
  
Shares
  
Weighted
Average
Exercise
Price
  
Weighted
Average
Remaining
Contractual
Term
(Years)
  
Aggregate
Intrinsic
Value
 
 
Outstanding as of September 30, 2016
  
38,460
  
$
9.94
   
4.21
   
-
 
Granted – Executives and management
  
-
   
-
   
-
   
-
 
Exercised
  
-
   
-
   
-
   
-
 
Forfeited or Expired
  
-
   
-
   
-
   
-
 
Outstanding at December 31, 2016
  
38,460
  
$
9.94
   
3.96
  
$
-
 
Exercisable
  
-
   
-
   
-
   
-
 
Vested and expected to vest
  
35,451
  
$
9.94
   
3.96
  
$
-
 
Time Based Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option activity under employee share option plan
A summary of time based option activity under the share option plan as of December 31, 2016, and changes during the three months then ended is presented below:
 
  
Shares
  
Weighted
Average
Exercise
Price
  
Weighted
Average
Remaining
Contractual
Term
(Years)
  
Aggregate
 Intrinsic
Value
 
Outstanding as of September 30, 2016
  
12,165
  
$
10.93
   
4.08
   
-
 
Granted
  
-
   
-
   
-
   
-
 
Exercised
  
-
   
-
   
-
   
-
 
Forfeited or Expired
  
-
   
-
   
-
   
-
 
Outstanding at December 31, 2016
  
12,165
  
$
10.93
   
3.67
  
$
-
 
Exercisable
  
-
   
-
   
-
   
-
 
Vested
  
12,165
  
$
10.93
   
3.67
  
$
-