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Note 15 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]
 6 Months Ended
Mar. 31, 2022
$ / shares
shares
Number of Shares Outstanding (in shares) | shares 399,469
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares $ 6.27
Number of Shares Granted (in shares) | shares 260,800
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares $ 3.09
Number of Shares Released (in shares) | shares (262,342)
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares $ 6.46
Number of Shares Forfeited/cancelled (in shares) | shares (15,000)
Weighted Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share) | $ / shares $ 5.05
Number of Shares Outstanding (in shares) | shares 382,927
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares $ 4.03