Note 4 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 1,868	$ 2,197
Weighted average number of shares of common stock outstanding (in shares)	22,471,350	22,386,566
Effect of dilutive securities (in shares)	71,617	209,395
Weighted average number of shares of common stock outstanding including effect of dilutive securities (in shares)	22,542,967	22,595,961
Basic earnings per share (in dollars per share)	$ 0.08	$ 0.10
Diluted earnings per share (in dollars per share)	$ 0.08	$ 0.10