Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - USD ($)	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Value of issuance of shares, tax withholding	$ 373,000	$ 425,000
Issuance of shares, tax withholding (in shares)	165,300	144,269

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

No definition available.

Name:	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration