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Note 8 - Stockholders' Equity - Stock Option and Warrant Activity (Details)
 3 Months Ended
Dec. 31, 2023
$ / shares
shares
Restricted Stock [Member]  
Outstanding (in shares) 200,000
Granted (in shares) 0
Exercised (in shares) 0
Forfeited (in shares) 0
Expired (in shares) 0
Outstanding (in shares) 200,000
Share-Based Payment Arrangement, Option [Member]  
Outstanding, Options (in shares) 1,831,515
Outstanding, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.56
Granted, Options (in shares) 0
Granted, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Exercised, Options (in shares) 0
Exercised, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited, Options (in shares) (29,018)
Forfeited, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.58
Expired, Options (in shares) (18)
Expired, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1,362.5
Outstanding, Options (in shares) 1,802,479
Outstanding, Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 2.56
Options vested and exercisable, Options (in shares) 1,192,642
Options vested and exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.14
Stock Warrants [Member]  
Outstanding (in shares) 1,757,629
Outstanding, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.64
Granted (in shares) 0
Granted, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Exercised (in shares) 0
Exercised, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited (in shares) 0
Forfeited, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Expired (in shares) (54,741)
Expired, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 10.17
Outstanding (in shares) 1,702,888
Outstanding, Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.43