Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (3,748,900)	$ 82,200
Research and Development Credits Expiration [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	67,800
Likely Utilization of Net Operating Loss and Credit Carryforwards [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 3,681,000