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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Operating Activities:    
Net income $ 5,022,902 $ 2,983,613
Less: Net income (loss) from discontinued operations 69,454 (49,061)
Income from continuing operations 4,953,448 3,032,674
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:    
Depreciation and amortization 138,191 206,013
Warranty provision 74,521 69,384
Inventory obsolescence (16,252) 60,799
Share-based compensation 422,643 475,472
Loss on impairment of patents 22,551 47,850
Unrealized gain on derivative revaluation   (747,917)
Changes in operating assets and liabilities:    
Restricted cash (606,250)  
Accounts receivable (910,149) (2,754,687)
Inventories 64,830 (199,679)
Prepaid expenses and other (458,914) (10,236)
Prepaid expenses - noncurrent (1,160,485)  
Accounts payable 75,155 9,401
Warranty settlements (47,366) (72,605)
Accrued liabilities 1,334,094 (111,704)
Net cash provided by operating activities of continuing operations 3,886,017 4,765
Net cash provided by operating activities of discontinued operations 131,694 365,208
Net cash provided by operating activities 4,017,711 369,973
Investing Activities:    
Purchase of equipment (57,888) (64,343)
Patent costs paid (2,291) (17,382)
Net cash used in investing activities (60,179) (81,725)
Financing Activities:    
Proceeds from exercise of warrants 4,346,613  
Proceeds from exercise of stock options 145,450 30,417
Net cash provided by financing activities 4,492,063 30,417
Net increase in cash and cash equivalents 8,449,595 318,665
Cash and cash equivalents, beginning of period 5,421,167 5,102,502
Cash and cash equivalents, end of period 13,870,762 5,421,167
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest 108 1,565
Cash paid for taxes 222,175 104,127
Noncash investing and financing activities:    
Reclassification of warrants from equity to a liability   747,917
Issued warrants classified as offering costs $ 2,164,773