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Note 17 - Net Income Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 11,874	$ 2,785
Basic income per share (in dollars per share)	$ 0.36	$ 0.09
Diluted income per share (in dollars per share)	$ 0.35	$ 0.08
Weighted average shares outstanding - basic (in shares)	33,220,915	32,689,028
Assumed exercise of dilutive options (in shares)	871,413	708,067
Weighted average shares outstanding - diluted (in shares)	34,092,328	33,397,095
Antidilutive securities (in shares)	893,750	573,750
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	893,750	573,750
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)

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