Note 16 - Net Income (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net income (loss)	$ 2,784,992	$ (3,745,042)
Basic (in dollars per share)	$ 0.09	$ (0.12)
Diluted (in dollars per share)	$ 0.08	$ (0.12)
Weighted average shares outstanding - basic (in shares)	32,689,028	32,492,645
Assumed exercise of dilutive options (in shares)	708,067
Weighted average shares outstanding - diluted (in shares)	33,397,095	32,492,645
Antidilutive securities (in shares)	573,750	3,613,188
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	573,750	3,394,858
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)		218,330