Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Stock Compensation Activity (Details)

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Note 6 - Stock-based Compensation - Stock Compensation Activity (Details) - USD ($)
 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2022
Outstanding, Option Shares Outstanding (in shares) 98,626 98,626  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 52.00 $ 52.00  
Outstanding, Weighted Average Remaining Contractual Term (Year)   5 years 8 months 19 days 1 year 4 months 9 days
Outstanding, Aggregate Intrinsic Value   $ 0 $ 16,900
Awarded, Option Shares Outstanding (in shares) 24,500    
Awarded, Weighted Average Exercise Price (in dollars per share) $ 8.00    
Forfeited/Cancelled, Option Shares Outstanding (in shares) (19,101)    
Forfeited/Cancelled, Weighted Average Exercise Price (in dollars per share) $ 70.00    
Outstanding at June 30, 2023 (in shares)   104,025 98,626
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 39.00   $ 52.00
Vested at June 30, 2023 (in shares)   79,409  
Vested at June 30, 2023 (in dollars per share)   $ 48.00  
Vested at June 30, 2023 (Year)   4 years 10 months 6 days  
Vested at June 30, 2023   $ 0  
Vested and expected to vest, Option Shares Outstanding (in shares) 104,325    
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) $ 39.00    
Vested and expected to vest,Weighted Average Remaining Contractual Term (Year) 5 years 8 months 19 days    
Vested and expected to vest, Aggregate Intrinsic Value $ 0