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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities:    
Net (loss) income $ (1,281,599) $ 9,687,816
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 167,693 238,314
Warranty provision 79,954 42,645
Inventory Obsolescence Write Down (Recoveries) 159,954 65,692
Share-based Compensation 605,426 619,201
Deferred income taxes (188,000) (8,339,000)
Changes in operating assets and liabilities:    
Accounts receivable (1,292,589) 2,167,728
Inventories 2,309 (1,096,128)
Prepaid expenses and other (29,972) (41,719)
Prepaid expenses and other, noncurrent 187,484 187,485
Accounts payable (129,376) (126,561)
Payroll and related 51,929 (2,702,307)
Warranty settlements (38,588) (41,338)
Accrued and other liabilities 556,278 (526,017)
Net cash (used in) provided by operating activities (1,149,097) 135,811
Investing Activities:    
Purchases of marketable securities (825,795) (4,299,414)
Capital expenditures (162,322) (344,266)
Patent costs paid (11,272) (10,477)
Net cash used in investing activities (999,389) (4,654,157)
Financing Activities:    
Repurchase of common stock (1,748,456) (1,564,666)
Proceeds from Stock Options Exercised 2,200 504,371
Common stock cash dividends paid (954,650)
Net cash used in financing activities (2,700,906) (1,060,295)
Net decrease in cash (4,849,392) (5,578,641)
Cash and cash equivalents, beginning of period 18,316,103 23,894,744
Cash and cash equivalents, end of period $ 13,466,711 $ 18,316,103