Employee Stock Purchase Plan (Details) - shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2013
Employee Stock Purchase Plan
Number of shares covered under the Employee Stock Purchase Plan (ESPP)			250,000
Purchase price per share as percentage of fair market value	95.00%
Issuance of shares under employee stock purchase plan (in shares)	31,372	32,939
Number of remaining shares authorized	420