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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:    
Net loss $ (812,680) $ (380,073)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 32,506 56,884
Warranty provision 9,696 (22,267)
Inventory obsolescence 24 6,081
Share-based compensation 464,749 147,940
Deferred income taxes (486,528) (311,195)
Changes in operating assets and liabilities:    
Accounts receivable 1,929,765 174,339
Inventories (327,680) (294,426)
Prepaid expenses and other 80,378 118,028
Other assets 46,871 46,871
Accounts payable 500,042 (226,055)
Payroll and related 180,766 1,459
Warranty settlements (12,742) (972)
Accrued and other liabilities (176,881) 289,243
Net cash provided by (used in) operating activities 1,428,286 (394,143)
Investing Activities:    
Sales (purchases) of marketable securities 84,610 (623,604)
Capital expenditures (13,863) (71,150)
Patent costs paid (1,721) (1,205)
Net cash provided by (used in) investing activities 69,026 (695,959)
Financing Activities:    
Repurchase of common stock (1,643,120)
Net cash used in financing activities (1,643,120)
Net increase (decrease) in cash 1,497,312 (2,733,222)
Cash and cash equivalents, beginning of period 13,466,711 18,316,103
Cash and cash equivalents, end of period $ 14,964,023 $ 15,582,881