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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating Activities:    
Net (loss) income $ (559,754) $ 22,058
Adjustments to reconcile net income to net cash provided by operating activities :    
Depreciation and amortization 67,524 45,011
Provision for doubtful accounts (400)  
Warranty provision 6,468 (40,007)
Inventory obsolescence (213,520) (98,686)
Share-based compensation 390,303 277,470
Loss on sale or impairment of patents 5,138 11,197
Changes in operating assets and liabilities:    
Accounts receivable 3,165,331 2,964,885
Inventories (1,539,679) (352,247)
Prepaid expenses and other 42,568 72,530
Prepaid expenses - noncurrent 93,750 22,984
Accounts payable 243,134 (602,704)
Warranty settlements (5,776) (15,014)
Accrued and other liabilities 295,523 (2,270,293)
Net cash provided by operating activities 1,990,610 37,184
Investing Activities:    
Purchase of equipment (82,925) (22,342)
Patent costs paid (2,733) (832)
Net cash used in investing activities (85,658) (23,174)
Financing Activities:    
Proceeds from exercise of stock options 19,228  
Net cash provided by financing activities 19,228  
Net increase in cash and cash equivalents 1,924,180 14,010
Cash and cash equivalents, beginning of period 13,859,505 13,870,762
Cash and cash equivalents, end of period 15,783,685 13,884,772
Supplemental Disclosure of Cash Flow Information    
Cash (refunded) paid for taxes $ (38,724) $ 60,015