| Cover | Aug. 06, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 6, 2021 |
| Entity File Number | 001-36769 |
| Entity Registrant Name | FRP HOLDINGS, INC. |
| Entity Central Index Key | 0000844059 |
| Entity Tax Identification Number | 47-2449198 |
| Entity Incorporation, State or Country Code | FL |
| Entity Address, Address Line One | 200 W. FORSYTH STREET |
| Entity Address, Address Line Two | 7TH FLOOR |
| Entity Address, City or Town | JACKSONVILLE |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 32202 |
| City Area Code | (904) |
| Local Phone Number | 858-9100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | FRPH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
