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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating Activities:    
Net income $ 1,462,020 $ 5,022,902
Less: Net income from discontinued operations (Note 16)   69,454
Net income from continuing operations 1,462,020 4,953,448
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:    
Depreciation and amortization 93,931 138,191
Provision for doubtful accounts 4,372  
Warranty provision (33,566) 74,521
Inventory obsolescence 154,109 (16,252)
Share-based compensation 684,451 422,643
Loss on impairment of patents 41,621 22,551
Changes in operating assets and liabilities:    
Restricted cash 606,250 (606,250)
Accounts receivable (424,118) (910,149)
Inventories (531,078) 64,830
Prepaid expenses and other 221,778 (458,914)
Prepaid expenses - noncurrent 116,734 (1,160,485)
Accounts payable (44,483) 75,155
Warranty settlements (34,382) (47,366)
Accrued liabilities (2,120,448) 1,334,094
Net cash provided by operating activities of continuing operations 197,191 3,886,017
Net cash (used in) provided by operating activities of discontinued operations (Note 17) (3,013) 131,694
Net cash provided by operating activities 194,178 4,017,711
Investing Activities:    
Purchase of equipment (201,804) (57,888)
Patent costs paid (3,631) (2,291)
Net cash used in investing activities (205,435) (60,179)
Financing Activities:    
Proceeds from exercise of common stock warrants   4,346,613
Proceeds from exercise of stock options 0 145,450
Net cash provided by financing activities   4,492,063
Net (decrease) increase in cash and cash equivalents (11,257) 8,449,595
Cash and cash equivalents, beginning of period 13,870,762 5,421,167
Cash and cash equivalents, end of period 13,859,505 13,870,762
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest   108
Cash (refunded) paid for taxes $ (152,344) $ 222,175