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Income Taxes - Tax carryforward and reconciliation of unrecognized tax benefit (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Tax credit carryforward      
Change in valuation allowance $ 451,000 $ 375,000  
Valuation allowance 3,471,164 3,922,620 $ 4,296,553
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits      
Balance at beginning of year 546,000 540,000 570,000
Unrecognized tax benefits related to prior years 39,000   52,000
Unrecognized tax benefits related to current year 37,000 6,000 11,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations (7,000)   (93,000)
Balance at end of year 615,000 546,000 540,000
Unrecognized tax benefits , if recognized, would impact effective tax rate 615,000 546,000 540,000
Unrecognized tax benefits against accrued interest 0    
Accrual recorded for penalties 0    
Expense for interest (net of federal impact) recognized 0 0 $ 0
Adjustments resulting from IRS examination 0    
R&D | Federal      
Tax credit carryforward      
Tax Credit carryforwards $ 1,589,000 $ 1,331,000