Note 9 - Income Taxes (Detail) - Deferred tax assets (liabilities) consist of the following: (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Current:
Inventories	$ 295,300	$ 244,300
Bad debts	(2,052)	(1,938)	(1,871)
Accrued liabilities	45,600	39,200
Prepaid expense	(11,500)	(16,800)
	332,800	270,100
Valuation allowance	(332,800)	(270,100)
Noncurrent:
Depreciation and amortization	53,400	86,500
Research and development and other credit carryforwards	1,716,300	1,700,400
Net operating loss carryforward	1,934,200	1,709,000
Contribution carryforward	163,200	250,400
Directors stock option plan	36,800	32,900
	3,903,900	3,779,200
Valuation allowance	(3,903,900)	(3,779,200)
Bad Debts [Member]
Current:
Bad debts	$ 3,400	$ 3,400