Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Valuation Assumptions (Details)

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Note 4 - Stock-based Compensation - Valuation Assumptions (Details)
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dividend yield 0.00%  
Vesting period (years) (Year) 4 years 284 days 3 years
Minimum [Member]    
Expected volatility 39.50%  
Risk-free interest rate 1.65%  
Expected life (years) (Year) 4 years  
Vesting period (years) (Year) 3 years  
Maximum [Member]    
Expected volatility 41.50%  
Risk-free interest rate 1.69%  
Expected life (years) (Year) 6 years  
Vesting period (years) (Year) 5 years