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Note 10 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%  
Deferred Tax Assets, Net $ 8,331,000  
Deferred Tax Assets, Tax Credit Carryforwards, Research 2,559,000 $ 2,461,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 72,709 288
Sustained Profitability, Number of Years 6 years  
Deferred Tax Assets, Valuation Allowance $ 12,306,000 $ 12,109,000
Effective Income Tax Rate Reconciliation, Percent 0.00%  
State and Local Jurisdiction [Member]    
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 569,000  
Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards 47,019,000  
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 1,990,000