Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Net income	$ 505,634us-gaap_NetIncomeLoss	$ 131,563us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,084us-gaap_DepreciationAndAmortization	35,203us-gaap_DepreciationAndAmortization
Provision for doubtful accounts		(3,772)us-gaap_ProvisionForDoubtfulAccounts
Warranty provision	19,198	14,361
Inventory obsolescence	(3,534)us-gaap_InventoryWriteDown	(4,414)us-gaap_InventoryWriteDown
Share-based compensation	131,447us-gaap_ShareBasedCompensation	149,814us-gaap_ShareBasedCompensation
Accounts receivable	1,796,831	3,061,072
Inventories	(493,989)us-gaap_IncreaseDecreaseInInventories	(752,689)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	54,364	491,154
Prepaid expenses and other - noncurrent	46,872	46,875
Accounts payable	105,786	(1,027,441)
Warranty settlements	(8,402)us-gaap_ProductWarrantyAccrualPayments	(11,362)us-gaap_ProductWarrantyAccrualPayments
Accrued and other liabilities	(2,817,785)	182,160
Net cash (used in) provided by operating activities	(601,494)	2,312,524
Purchases of marketable securities	(3,123,401)
Capital expenditures	(79,501)	(124,793)
Patent costs paid	(146)	(80)
Net cash used in investing activities	(3,203,048)	(124,873)
Repurchase of common stock		(99,597)
Proceeds from exercise of stock options		193,064
Net cash provided by financing activities		93,467
Net (decrease) increase in cash	(3,804,542)	2,281,118
Cash and cash equivalents, beginning of period	23,894,744	15,805,195
Cash and cash equivalents, end of period	20,090,202	18,086,313
Supplemental Disclosure of Cash Flow Information
Cash paid for taxes		$ 100us-gaap_IncomeTaxesPaid

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