Other Income (Narrative) (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021
Other Income [Line Items]
Proceeds from Insurance Settlement, Investing Activities			$ 272,000
Other income (expense)	$ 2,000		272,000
Tower in Des Moines Iowa [Member]
Other Income [Line Items]
Proceeds from Insurance Settlement, Investing Activities		$ 290,000	250,000
Other income (expense)	$ 540,000	$ 290,000	$ 250,000

Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21B
-URI http://asc.fasb.org/extlink&oid=123570139&loc=SL94080549-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

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