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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating Activities:    
Net (loss) income $ (1,044,736) $ 796,145
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 97,546 120,074
Warranty provision 26,303 40,674
Inventory obsolescence 11,067 22,908
Share-based compensation 308,257 $ 308,854
Deferred income taxes (857,706)
Changes in operating assets and liabilities:    
Accounts receivable (361,037) $ 1,936,920
Inventories (287,325) (689,050)
Prepaid expenses and other (82,637) (169,544)
Prepaid expenses and other, noncurrent 93,742 93,743
Accounts payable 738,256 206,149
Warranty settlements (24,099) (27,749)
Accrued and other liabilities 1,172,443 (2,617,351)
Net cash (used in) provided by operating activities (209,926) 21,773
Investing Activities:    
Purchases of marketable securities (612,219) (4,544,977)
Capital expenditures (126,594) (170,999)
Patent costs paid (5,658) (1,087)
Net cash used in investing activities (744,471) (4,717,063)
Financing Activities:    
Repurchase of common stock $ (1,748,456) (158,740)
Proceeds from exercise of stock options $ 107,214
Common stock cash dividends paid $ (636,661)
Net cash used in financing activities (2,385,117) $ (51,526)
Net decrease in cash (3,339,514) (4,746,816)
Cash and cash equivalents, beginning of period 18,316,103 23,894,744
Cash and cash equivalents, end of period $ 14,976,589 $ 19,147,928