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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Net income (loss) $ 131,563 $ (100,376)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 35,203 30,716
Provision for doubtful accounts (3,772) (200)
Warranty provision 14,361 (9,445)
Inventory obsolescence (4,414) (29,701)
Share-based compensation 149,814 205,978
Loss on sale or impairment of patents   5,138
Changes in operating assets and liabilities:    
Accounts receivable 3,061,072 3,249,384
Inventories (752,689) (1,050,152)
Prepaid expenses and other 491,154 84,902
Prepaid expenses and other - noncurrent 46,875 46,875
Accounts payable (1,027,441) (204,313)
Warranty settlements (11,362) (4,275)
Accrued and other liabilities 182,160 113,452
Net cash provided by operating activities 2,312,524 2,337,983
Capital expenditures (124,793) (76,655)
Patent costs paid (80) (983)
Net cash used in investing activities (124,873) (77,638)
Repurchase of common stock (99,597)  
Proceeds from exercise of stock options 193,064 19,228
Net cash provided by financing activities 93,467 19,228
Net increase in cash 2,281,118 2,279,573
Cash, beginning of period 15,805,195 13,859,505
Cash, end of period 18,086,313 16,139,078
Supplemental Disclosure of Cash Flow Information    
Cash paid (refunded) for taxes $ 100 $ (40,324)