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Supplemental Balance Sheet Disclosures (Details 3) (USD $)
 3 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Accrued expenses    
Warranty $ 799,748  
Salary, benefits and payroll taxes 272,204 531,862
Professional fees 380,998 330,858
Income taxes payable 76,160 132,980
Materials on order 60,871 43,374
Other 1,019,047 834,239
Total 2,609,028 2,723,812
Warranty cost and accrual information    
Warranty accrual, beginning of period 850,499  
Accrued expense for fiscal year (12,931)  
Warranty cost incurred for fiscal year (37,820)  
Warranty accrual, end of period $ 799,748