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Note 12 - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Years ended September 30,
 
   
2018
   
2017
 
Current tax provision
               
Federal
  $
-
    $
-
 
State
   
1,600
     
1,600
 
Total current tax provision
   
1,600
     
1,600
 
Deferred provision
               
Federal
   
2,017,900
     
166,600
 
State
   
356,100
     
29,400
 
Total deferred provision
   
2,374,000
     
196,000
 
                 
Provision for income taxes
  $
2,375,600
    $
197,600
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Years ended September 30,
 
   
2018
   
2017
 
Income taxes computed at the federal statutory rate
  $
(332,000
)   $
(231,000
)
Change in valuation allowance
   
2,711,000
     
197,000
 
Change in tax rate
   
6,754,000
     
-
 
Expired net operating loss carryforwards
   
441,000
     
283,000
 
Nondeductible compensation, interest expense and other
   
39,000
     
21,000
 
State income taxes, net of federal tax benefit
   
(41,000
)    
(24,000
)
Change in R&D credit carryover
   
(133,000
)    
(98,000
)
Stock options and other prior year true-ups
   
(499,000
)    
48,000
 
Acquired deferred tax assets of Genasys Spain
   
(6,564,400
)    
1,600
 
Provision for income taxes
  $
2,375,600
    $
197,600
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
At September 30,
 
 
 
2018
   
2017
 
Deferred tax assets:
               
Net operating loss carryforwards
  $
13,644,000
    $
16,443,000
 
Research and development credit
   
5,805,000
     
2,559,000
 
Share-based compensation
   
532,000
     
898,000
 
Equipment
   
(41,000
)    
(80,000
)
Patents
   
35,000
     
69,000
 
Accruals and other
   
818,000
     
546,000
 
State tax deduction
   
(5,000
)    
(7,000
)
Federal AMT Credit
   
53,000
     
52,000
 
Allowances
   
133,000
     
157,000
 
Gross deferred tax asset
   
20,974,000
     
20,637,000
 
Less valuation allowance
   
(15,017,000
)    
(12,306,000
)
Total deferred tax assets, net of valuation allowance
  $
5,957,000
    $
8,331,000