Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 260	$ 227
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	43,890,000	36,461,000
Common stock, shares outstanding (in shares)	36,984,000	29,551,000
Treasury stock, shares held (in shares)	6,906,000	6,906,000