Note 10 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Inventories	$ 302,600	$ 81,500
Bad debts	3,400	3,400
Accrued liabilities	77,700	70,600
Prepaid expense	(8,900)	(13,400)
Depreciation and amortization	93,000	46,700
Research and development and other credit carryforwards	2,019,700	1,980,200
Net operating loss carryforward	1,303,000	1,914,300
Directors stock option plan	40,100	40,100
Acquisition costs		125,500
	3,830,600	4,248,900
Valuation allowance	(500,000)	(4,248,900)
Total	$ 3,330,600	$ 0