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Note 10 - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
 
 
Years ended September 30,
 
 
 
2016
 
 
2015
 
Current tax benefit
               
Federal
  $ -     $ -  
State
    1,840       (7,700 )
Total current tax benefit
    1,840       (7,700 )
Deferred benefit
               
Federal
    (159,800 )     (7,564,000 )
State
    (28,200 )     (775,000 )
Total deferred benefit
    (188,000 )     (8,339,000 )
Change in valuation allowance
    -       -  
Provision for income taxes
  $ (186,160 )   $ (8,346,700 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Years ended September 30,
 
 
 
2016
 
 
2015
 
Income taxes computed at the federal statutory rate
  $ (499,000 )   $ 456,000  
Change in valuation allowance
    (66,000 )     (8,316,000 )
Expired net operating loss carryforwards
    487,000       598,000  
Nondeductible compensation,
interest expense and other
    99,000       20,000  
State income taxes, net of federal tax benefit
    (36,000 )     24,000  
Change in R&D credit carryover
    (98,000 )     (17,000 )
Stock options and other prior year true-ups
    (75,000 )     (1,103,000 )
Other
    1,840       (8,700 )
Provision for income taxes   $ (186,160 )   $ (8,346,700 )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
 
 
At September 30,
 
Deferred tax assets:
 
2016
 
 
2015
 
Net operating loss carryforwards
  $ 16,410,000     $ 16,966,000  
Research and development credit
    2,461,000       2,309,000  
Share-based compensation
    598,000       468,000  
Equipment
    (23,000 )     (24,000 )
Patents
    102,000       134,000  
Accruals and other
    832,000       465,000  
State tax deduction
    (7,000 )     (6,000 )
Federal AMT Credit
    52,000       52,000  
Allowances
    211,000       150,000  
Gross deferred tax asset
    20,636,000       20,514,000  
Less valuation allowance
    (12,109,000 )     (12,175,000 )
Total deferred tax assets, net of valuation allowance
  $ 8,527,000     $ 8,339,000