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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:    
Net loss $ (1,683,253) $ (812,680)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 60,105 32,506
Warranty provision 12,361 9,696
Inventory obsolescence 40,301 24
Share-based compensation 138,461 464,749
Deferred income taxes 2,708,888 (486,528)
Changes in operating assets and liabilities:    
Accounts receivable 3,662 1,929,765
Inventories (43,001) (327,680)
Prepaid expenses and other 393,761 80,378
Other assets 46,874 46,871
Accounts payable 790,635 500,042
Accrued and other liabilities (715,209) (8,857)
Net cash provided by operating activities 1,753,585 1,428,286
Investing Activities:    
Purchases of marketable securities (1,673,295) (1,470,704)
Proceeds from maturities of marketable securities 2,128,016 1,555,314
Capital expenditures (54,167) (13,863)
Patent costs paid (1,721)
Net cash provided by investing activities 400,554 69,026
Financing Activities:    
Proceeds from exercise of stock options 159,518
Net cash provided by financing activities 159,518
Net increase in cash 2,313,657 1,497,312
Cash and cash equivalents, beginning of period 12,803,887 13,466,711
Cash and cash equivalents, end of period 15,117,544 14,964,023
Noncash investing activities:    
Change in unrealized loss on marketable securities $ (8,031) $ (6,310)