Common Stock and Units - Additional Information (Detail)					2 Months Ended	9 Months Ended		12 Months Ended	21 Months Ended
	Feb. 05, 2018 shares	Jan. 01, 2018 shares	Feb. 15, 2017 shares	Dec. 02, 2016 USD ($) $ / shares	Feb. 28, 2017 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Aug. 31, 2018 USD ($) $ / shares
Class of Stock [Line Items]
Common stock, shares authorized						49,000,000		49,000,000	49,000,000
Common stock, par value | $ / shares				$ 0.01		$ 0.01		$ 0.01	$ 0.01
Voting right						Each outstanding share of common stock entitles the holder to one vote on all matters submitted to a vote of stockholders.
Repurchased common stock, value | $								$ 5,900,000
Number of common stock shares repurchased						0		882,820
Number of common stock, shares purchased					682,500		682,500
Purchased common stock, value | $					$ 4,900,000		$ 4,900,000
Proceeds from sale of common stock, net | $						$ 577,661
Common stock, shares outstanding						14,209,378		14,078,831	14,209,378
Common stock exchange ratio						1			1
Redemption of units in operating partnership									0
Operating Partnership common units not owned						1,778,140		1,778,140	1,778,140
Sotherly Hotels LP [Member]
Class of Stock [Line Items]
Proceeds from sale of common stock, net | $						$ 577,661
Operating Partnership common units outstanding						15,987,518		15,856,971	15,987,518
Fair market value | $						$ 12,800,000		$ 11,500,000	$ 12,800,000
Common Stock [Member]
Class of Stock [Line Items]
Stock issued during period						88,297
Restricted shares issued						40,000
Common Stock [Member] | Sotherly Hotels LP [Member]
Class of Stock [Line Items]
Number of issued unit in Operating Partnership	17,250	25,000	12,000
Restricted shares issued	15,000	25,000	12,000
Non-restricted shares issued	2,250
Sales Agency Agreement [Member] | Sandler O’Neill [Member]
Class of Stock [Line Items]
Common stock, par value | $ / shares										$ 0.01
Aggregate gross sale price of common stock | $										$ 5,000,000
Proceeds from sale of common stock, net | $						$ 600,000
Sales Agency Agreement [Member] | Sandler O’Neill [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, par value | $ / shares										$ 0.01
Aggregate gross sale price of common stock | $										$ 5,000,000
Stock issued during period						88,297
Maximum [Member]
Class of Stock [Line Items]
Repurchased common stock, value | $				$ 10,000,000