Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Statement Of Financial Position [Abstract]
Trade accounts and financing receivables, allowance	$ 428	$ 496
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	13,738,971	13,670,639
Common stock, shares outstanding	12,969,542	13,670,639
Treasury stock, shares	769,429