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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Operating Activities:    
Net (loss) income $ (100,376) $ 313,946
Adjustments to reconcile net income to net cash provided by operating activities :    
Depreciation and amortization 30,716 22,776
Provision for doubtful accounts (200)  
Warranty provision (9,445) 64,310
Inventory obsolescence (29,701) 162,602
Share-based compensation 205,978 139,286
Loss on sale or impairment of patents 5,138 10,616
Changes in operating assets and liabilities:    
Accounts receivable 3,249,384 2,358,304
Inventories (1,050,152) (366,924)
Prepaid expenses and other 84,902 107,450
Prepaid expenses-noncurrent 46,875 15,515
Accounts payable (204,313) (443,881)
Warranty settlements (4,275) (13,095)
Accrued and other liabilities 113,452 (2,392,446)
Net cash provided by (used in) operating activities 2,337,983 (21,541)
Investing Activities:    
Purchase of equipment (76,655) (3,617)
Patent costs paid (983) (227)
Net cash used in investing activities (77,638) (3,844)
Financing Activities:    
Proceeds from exercise of stock options 19,228  
Net cash provided by financing activities 19,228  
Net increase (decrease) in cash and cash equivalents 2,279,573 (25,385)
Cash and cash equivalents, beginning of period 13,859,505 13,870,762
Cash and cash equivalents, end of period 16,139,078 13,845,377
Supplemental Disclosure of Cash Flow Information    
Cash (refunded) paid for taxes $ (40,324) $ 50,000