4. Investment Securities (Details 1) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Book value of available for sale securities, pledged as collateral for repurchase agreements	$ 42,180,395	$ 40,186,557
Fair value of available for sale securities, pledged as collateral for repurchase agreements	$ 42,579,295	$ 39,366,831

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant