Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 537	$ 520
Serial preferred shares, shares authorized (in shares)	1,000,000	1,000,000
Common shares, par value (in dollars per share)	$ 1	$ 1
Common shares, shares authorized (in shares)	10,000,000	10,000,000
Common shares, shares issued (in shares)	5,773,000	5,690,000
Common shares, shares outstanding (in shares)	5,773,000	5,690,000