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Note 16 - Net Income (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Net income (loss)	$ 1,178,850	$ 1,045,940	$ 460,908	$ (1,683,252)	$ 2,224,790	$ (1,222,344)
Basic income (loss) per share (in dollars per share)	$ 0.04		$ 0.01		$ 0.07	$ (0.04)
Diluted income (loss) per share (in dollars per share)	$ 0.04		$ 0.01		$ 0.07	$ (0.04)
Weighted average shares outstanding - basic (in shares)	32,584,952		32,275,647		32,738,871	32,212,286
Assumed exercise of dilutive options (in shares)	492,303		1,023,559		533,293
Weighted average shares outstanding - diluted (in shares)	33,077,255		33,299,206		33,272,164	32,212,286
Antidilutive securities (in shares)	976,750		1,984,580		976,750	2,924,897
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	976,750		1,766,250		976,750	2,706,567
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)			218,330			218,330

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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