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Note 17 - Net Income Per Share - Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended						9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 1,504,077	$ 301,575	$ 620,327	$ 638,041	$ 1,178,850	$ 1,045,940	$ 2,425,979	$ 2,862,831
Basic income per share (in dollars per share)	$ 0.05			$ 0.02			$ 0.07	$ 0.09
Diluted income per share (in dollars per share)	$ 0.04			$ 0.02			$ 0.07	$ 0.09
Weighted average shares outstanding - basic (in shares)	33,289,426			32,575,118			33,122,042	32,684,311
Assumed exercise of dilutive options (in shares)	991,489			797,659			756,201	656,746
Weighted average shares outstanding - diluted (in shares)	34,280,915			33,372,777			33,878,243	33,341,057
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	893,750			761,250			893,750	976,750

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