Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities:
Net (loss) income	$ (767,814)	$ 732,198
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	133,844	182,569
Provision for doubtful accounts	11,018
Warranty provision	30,610	19,720
Inventory obsolescence	1,408	42,286
Share-based compensation	456,279	461,717
Deferred income taxes	(864,560)
Changes in operating assets and liabilities:
Accounts receivable	(442,115)	1,549,018
Inventories	(257,354)	(1,224,048)
Prepaid expenses and other	(15,115)	(75,767)
Prepaid expenses and other, noncurrent	140,613	140,614
Accounts payable	750,313	570,066
Payroll and related	869,999	(2,425,472)
Warranty settlements	(31,949)	(33,260)
Accrued and other liabilities	169,756	(562,312)
Net cash provided by (used in) operating activities	184,933	(622,671)
Investing Activities:
Purchases of marketable securities	(81,476)	(4,741,067)
Capital expenditures	(163,521)	(273,482)
Patent costs paid	(6,200)	(3,385)
Net cash used in investing activities	(251,197)	(5,017,934)
Financing Activities:
Repurchase of common stock	(1,748,456)	(965,474)
Proceeds from exercise of stock options		494,834
Common stock cash dividends paid	(954,650)
Net cash used in financing activities	(2,703,106)	(470,640)
Net decrease in cash	(2,769,370)	(6,111,245)
Cash and cash equivalents, beginning of period	18,316,103	23,894,744
Cash and cash equivalents, end of period	$ 15,546,733	$ 17,783,499