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Note 2 - Net Income Per Share - Net Income Per Common Share (Details) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 943,158	$ 876,930
Weighted average common shares (in shares)	13,443,945	13,567,484
Dilutive potential common shares (in shares)	32,472	223,309
Weighted average dilutive common shares outstanding (in shares)	13,476,417	13,790,793
Net income per common share:
Basic (in dollars per share)	$ 0.07	$ 0.06
Diluted (in dollars per share)	$ 0.07	$ 0.06

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