Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Statement Of Financial Position [Abstract]
Trade accounts and financing receivables, allowance	$ 496	$ 951
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	13,670,639	13,630,666
Common stock, shares outstanding	13,670,639	13,630,666