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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating Activities:    
Net loss $ (1,042,492) $ (767,814)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 93,859 133,844
Provision for doubtful accounts 11,018
Inventory obsolescence (186,772) 1,408
Share-based compensation 943,923 456,279
Deferred income taxes (754,569) (864,560)
Changes in operating assets and liabilities:    
Accounts receivable 1,024,797 (442,115)
Inventories (760,351) (257,354)
Prepaid expenses and other (22,923) (15,115)
Other assets 180,063 140,613
Accounts payable 1,223,342 750,313
Accrued and other liabilities 291,725 1,038,416
Net cash provided by operating activities 990,602 184,933
Investing Activities:    
Purchases of available-for-sale marketable securities (2,304,263) (1,301,829)
Proceeds from maturities of available-for-sale marketable securities 2,402,861 1,220,353
Capital expenditures (171,735) (163,521)
Patent costs paid (7,789) (6,200)
Net cash used in investing activities (80,926) (251,197)
Financing Activities:    
Repurchase of common stock (1,748,456)
Common stock cash dividends paid (954,650)
Net cash used in financing activities (2,703,106)
Net increase (decrease) in cash 909,676 (2,769,370)
Cash and cash equivalents, beginning of period 13,466,711 18,316,103
Cash and cash equivalents, end of period $ 14,376,387 $ 15,546,733