Document and Entity Information - USD ($)

12 Months Ended

Dec. 31, 2019

Jun. 30, 2019

Cover [Abstract]

Entity Registrant Name

AMERICA FIRST MULTIFAMILY INVESTORS, L.P.

Entity Central Index Key

0001059142

Current Fiscal Year End Date

--12-31

Entity Filer Category

Accelerated Filer

Document Type

10-K

Entity Small Business

true

Entity Emerging Growth Company

false

Entity Shell Company

false

Document Period End Date

Dec. 31, 2019

Document Fiscal Year Focus

2019

Document Fiscal Period Focus

FY

Amendment Flag

false

Trading Symbol

ATAX

Title of each class

Beneficial Unit Certificates representing assignments of limited partnership interests in America First Multifamily Investors, L.P.

Name of each exchange on which registered

NASDAQ

Entity Common Stock, Units Outstanding

0

Entity Well-known Seasoned Issuer

No

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity File Number

000-24843

Entity Tax Identification Number

47-0810385

Entity Address, Address Line One

14301 FNB Parkway

Entity Address, Address Line Two

Suite 211

Entity Address, City or Town

Omaha

Entity Address, State or Province

NE

Entity Address, Postal Zip Code

68154

City Area Code

402

Local Phone Number

952-1235

Document Annual Report

true

Document Transition Report

false

Entity Incorporation, State or Country Code

DE

Entity Public Float

$ 432,123,245

Documents Incorporated by Reference

None