Note 2 - Net Income Per Share - Net Income Per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 1,952,900	$ 1,174,840	$ 3,310,934	$ 4,383,471
Weighted average common shares (in shares)	13,200,121	13,045,913	13,204,625	12,827,199
Dilutive potential common shares (in shares)	414,828	502,035	376,473	742,195
Weighted average dilutive common shares outstanding (in shares)	13,614,949	13,547,948	13,581,098	13,569,394
Net income per common share:
Basic (in dollars per share)	$ 0.15	$ 0.09	$ 0.25	$ 0.34
Diluted (in dollars per share)	$ 0.14	$ 0.08	$ 0.24	$ 0.32