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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income (loss) $ 657,489 $ (559,754)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 87,436 67,524
Provision for doubtful accounts 8,036 (400)
Warranty provision 83,518 6,468
Inventory obsolescence (33,088) (213,520)
Share-based compensation 341,422 390,303
Loss on sale or impairment of patents 6,980 5,138
Changes in operating assets and liabilities:    
Accounts receivable 2,190,096 3,165,331
Inventories (873,904) (1,539,679)
Prepaid expenses and other 377,698 42,568
Prepaid expenses and other - noncurrent 93,750 93,750
Accounts payable (478,789) 243,134
Warranty settlements (36,069) (5,776)
Accrued and other liabilities 565,906 295,523
Net cash provided by operating activities 2,990,481 1,990,610
Capital expenditures (203,876) (82,925)
Patent costs paid (3,645) (2,733)
Net cash used in investing activities (207,521) (85,658)
Repurchase of common stock (248,957)  
Proceeds from exercise of stock options 193,064 19,228
Net cash (used in) provided by financing activities (55,893) 19,228
Net increase in cash 2,727,067 1,924,180
Cash, beginning of period 15,805,195 13,859,505
Cash, end of period 18,532,262 15,783,685
Supplemental Disclosure of Cash Flow Information    
Cash paid (refunded) for taxes $ 100 $ (38,724)