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Note 15 - Share-based Compensation - Restricted Stock Activity (Details)
 12 Months Ended
Sep. 30, 2023
$ / shares
shares
Number of Shares Outstanding (in shares) | shares 379,597
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares $ 3.99
Restricted Stock Units (RSUs) [Member]  
Number of Shares Outstanding (in shares) | shares 342,841
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares $ 4.11
Number of Shares Granted (in shares) | shares 295,600
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares $ 3.63
Number of Shares Released (in shares) | shares (253,012)
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares $ 3.73
Forfeited/Cancelled, shares (in shares) | shares (5,832)
Weighted Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share) | $ / shares $ 7.2