Note 18 - Net Income Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 704	$ 11,874
Basic income per share (in dollars per share)	$ 0.02	$ 0.36
Diluted income per share (in dollars per share)	$ 0.02	$ 0.35
Weighted average shares outstanding - basic (in shares)	34,409,478	33,220,915
Assumed exercise of dilutive options (in shares)	1,179,670	871,413
Weighted average shares outstanding - diluted (in shares)	35,589,148	34,092,328
Antidilutive securities (in shares)	1,243,692	893,750
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	1,035,000	893,750
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)	0	0
Obligation to Issue Common Stock [Member]
Antidilutive securities (in shares)	208,692	0