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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating Activities:    
Net income $ 732,198 $ 2,600,304
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization $ 182,569 147,534
Provision for doubtful accounts   5,716
Warranty provision $ (19,720) (147,887)
Inventory obsolescence 42,286 19,032
Share-based compensation $ 461,717 488,958
Loss on sale or impairment of patents   6,980
Changes in operating assets and liabilities:    
Accounts receivable $ 1,549,018 1,204,313
Inventories (1,224,048) (163,281)
Prepaid expenses and other (75,767) 454,185
Prepaid expenses and other, noncurrent 140,614 140,625
Accounts payable 570,066 (944,129)
Warranty settlements (33,260) (40,975)
Accrued and other liabilities (2,987,784) 1,860,328
Net cash (used in) provided by operating activities (622,671) $ 5,927,477
Investing Activities:    
Purchases of marketable securities (4,741,067)  
Capital expenditures (273,482) $ (242,483)
Patent costs paid (3,385) (6,348)
Net cash used in investing activities (5,017,934) (248,831)
Financing Activities:    
Repurchase of common stock (965,474) (476,494)
Proceeds from exercise of stock options 494,834 193,064
Net cash used in financing activities (470,640) (283,430)
Net (decrease) increase in cash (6,111,245) 5,395,216
Cash and cash equivalents, beginning of period 23,894,744 15,805,195
Cash and cash equivalents, end of period $ 17,783,499 21,200,411
Supplemental Disclosure of Cash Flow Information    
Cash paid for taxes   $ 325