Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 46,338,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	1,783,000
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	797,000
Unrecognized Tax Benefits	0
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1,130,000
Valuation Allowance, Deferred Tax Assets, Released	8,339,000
Deferred Tax Assets, Valuation Allowance	$ 12,175,000	$ 20,491,000
Sustained Profitability, Number of Years	6 years
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%
Deferred Tax Assets, Net	$ 20,514,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 2,309,000	$ 2,182,000
Effective Income Tax Rate Reconciliation, Percent	0.00%