Note 16 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Shares Outstanding (in shares) | shares	303,014
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares	$ 2.82
Number of Shares Granted (in shares) | shares	325,365
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	$ 7.06
Number of Shares Released (in shares) | shares	(228,633)
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares	$ 2.83
Number of Shares Forfeited/cancelled (in shares) | shares	(277)
Weighted Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share) | $ / shares	$ 2.26
Number of Shares Outstanding (in shares) | shares	399,469
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) | $ / shares	$ 6.27