Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Customer Concentration Risk [Member] | Customer 1 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	21.00%	22.00%
Customer Concentration Risk [Member] | Customer 2 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	19.00%	18.00%
Customer Concentration Risk [Member] | Customer 3 [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage		10.00%
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Capital Lease Obligations	$ 0	$ 0
Deferred Revenue for Collection Issues	0	0
Allowance for Doubtful Accounts Receivable	$ 0	$ 0
Number of Major Customers Accounted for Accounts Receivable	2	3
Investments, Typical Final Maturity Maximum	3 years
Investments, Typical Portfolio Weighted Average Maturity	1 year 180 days
Inventory Obsolescence Write Down (Recoveries)	$ 65,692	$ 36,967
Finite-Lived Intangible Asset, Useful Life	15 years
Product Warranty Period	1 year
Shipping, Handling and Transportation Costs	$ 120,317	255,680
Advertising Expense	61,680	61,588
Product Warranty Accrual	$ 315,618	$ 314,311	$ 212,759
Number of Reportable Segments	1
Warrant Registration Statement Filing Period	30 days
Initial Liquidated Damages Payable to Warrant Holders Per Day | $ / shares	$ 0.01335
Period for Which Initial Liquidated Damages Payable to Warrant Holders	180 days
Liquidated Damages Payable to Warrant Holders Per Day Thereafter | $ / shares	$ 0.0267
Maximum Liquidated Damages Payable to Warrant Holders Per Share | $ / shares	$ 0.534
Maximum Amount of Liquidated Damages Payable to Warrant Holders	$ 869,323
Term of Warrants	5 years