Note 16 - Net Income (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 1,045,940	$ (1,683,253)
Weighted average common shares outstanding (in shares)	32,896,021	32,236,039
Assumed exercise of dilutive options and restricted stock units (in shares)	674,845
Weighted average dilutive shares outstanding (in shares)	33,570,866	32,236,039
Basic income (loss) per common share (in dollars per share)	$ 0.03	$ (0.05)
Diluted income (loss) per common share (in dollars per share)	$ 0.03	$ (0.05)
Antidilutive securities (in shares)	991,750	3,414,067
Employee Stock Option [Member]
Antidilutive securities (in shares)	991,750	3,289,067
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)		125,000