Public Housing Capital Fund Trust Certificates - Additional Information (Details)	12 Months Ended
Dec. 31, 2019 USD ($) Option	Dec. 31, 2018 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Impairment charge		$ 1,141,020
Public housing capital fund trusts [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of tender option bonds \| Option	3
Impairment charge	$ 0	$ 1,100,000

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562

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