Annual report pursuant to Section 13 and 15(d)

Income taxes (Details 2)

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Income taxes (Details 2) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Net operating loss carryforwards      
Valuation allowance established against the deferred tax asset   $ 968,000  
Unrecognized tax benefits      
Net unrecognized tax benefits 1,100,000 1,000,000  
Unrecognized tax benefits that, if recognized, would affect the annual effective income tax rate 1,100,000    
Interest and penalties included in net liability balance 500,000 500,000  
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits      
Balance at beginning of year   1,059,000 1,172,000
Lapse of statute of limitations   (230,000) (113,000)
Reductions for tax positions of prior years   (17,000)  
Balance at end of year 812,000 812,000 1,059,000
United States
      
Net operating loss carryforwards      
Net operating loss carryforwards 4,500,000 6,900,000  
Deferred tax asset, foreign 2,400,000 3,100,000  
Valuation allowance established against the deferred tax asset 0    
Canada
      
Net operating loss carryforwards      
Net operating loss carryforwards 800,000 3,900,000  
Deferred tax asset, foreign 200,000 1,000,000  
Net operating loss utilized 3,100,000    
Maximum
      
Unrecognized tax benefits      
Interest expense recognized related to unrecognized tax benefits $ 100,000 $ 100,000 $ 100,000