Stockholders' Equity (Narrative) (Details) - USD ($)							12 Months Ended
	Mar. 31, 2023	Aug. 03, 2022	Apr. 08, 2021	Jun. 01, 2018	Dec. 31, 2016	Dec. 31, 2010	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, shares authorized							300,000,000	300,000,000
Common stock, par value							$ 0.01	$ 0.01
Preferred stock, shares authorized							10,000,000	10,000,000
Preferred stock, par value							$ 10.00	$ 10.00
Options, Exercised (in shares)							102,125	339,125
Convertible Preferred Stock, Shares Issuable upon Conversion							the Company’s shares of Series N preferred stock, each of which is convertible to 40 common shares, have the right to receive dividends or dividend equivalents should the Company declare dividends on its common stock.
Series N preferred shares, conversion price per share							$ 1,000
Series N preferred stock, each convertible to common shares							40
Series N preferred stockholders to liquidation preference, conversion price per share							$ 1,000	$ 1,000
Number of Shares Authorized for Stock-Based Compensation Plan							4
Term of Stock-Based Compensation Plan							7 years	6 years
Options to purchase, Granted (in shares)			25,000				470,000	279,500
Exercise Price, Outstanding							$ 1.71	$ 1.38	$ 1.23
Exercise price, options granted in period							$ 2.91	$ 1.62
Number of Shares Authorized for Stock-Based Compensation Plan							4
Stock-based compensation expense							$ 776,000	$ 540,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares							990,125	1,003,375
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value							$ 2.38	$ 1.8
Unrecognized stock-based compensation							$ 1,400,000
Unrecognized stock-based compensation, Period for recognition							2 years 8 months 12 days
Fair Value of Options Vested in Period							$ 600,000	$ 700,000
Aggregate intrinsic value of exercisable options							$ 2,000,000	$ 1,500,000
Other Options Issued [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)							0	21,250
Options to purchase, Granted (in shares)									150,000	90,000
Exercise price, options granted in period									$ 1.78	$ 1.41
On March 31, 2023 [Member]
Class Of Stock [Line Items]
Issuance of restricted common stock (in shares)	90,000
Weighted average grant date fair value							$ 2.87
Unrecognized stock-based compensation expense							$ 39,500
On March 31, 2023 [Member] | Restricted Stock [Member]
Class Of Stock [Line Items]
Stock-based compensation expense							175,800
On June 1, 2018 [Member]
Class Of Stock [Line Items]
Unrecognized stock-based compensation expense							0	$ 21,500
On March 30, 2021 [Member] | Restricted Stock [Member]
Class Of Stock [Line Items]
Shares restriction term of service			2 years
On August 3, 2022 [Member] | Restricted Stock [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)		40,000
Stock-based compensation expense							$ 44,400	124,600
Weighted average grant date fair value							$ 1.58
Unrecognized stock-based compensation expense							$ 0	44,000
Weighted average vesting shares		75,000
Annual Compensation Plan [Member] | Employee Stock Option
Class Of Stock [Line Items]
Tax benefit recognized							2,600,000	500,000
Annual Compensation Plan [Member] | Employee Stock Option | Selling, General and Administrative Expenses [Member]
Class Of Stock [Line Items]
Stock-based compensation expense							$ 800,000	$ 400,000
2010 Non-Qualified Stock Option Plan [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)							5,000	147,500
Number of Shares Authorized for Stock-Based Compensation Plan						1,250,000
Options to purchase, Granted (in shares)							0	100,000
Stock Option Award Vesting Period						4 years
Number of Shares Authorized for Stock-Based Compensation Plan						1,250,000
2010 Non-Qualified Stock Option Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding						$ 0.4
2010 Non-Qualified Stock Option Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding						$ 2.77
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)								100,000
2016 Stock Option Plan [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)							91,750	170,375
Number of Shares Authorized for Stock-Based Compensation Plan					3,150,000
Options to purchase, Granted (in shares)							0	35,000
Stock Option Award Vesting Period					4 years
Number of Shares Authorized for Stock-Based Compensation Plan					3,150,000
2016 Stock Option Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding					$ 0.45
2016 Stock Option Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding					$ 3.33
2022 Stock Option Plan [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)							5,375	0
Number of Shares Authorized for Stock-Based Compensation Plan								3,500,000
Options to purchase, Granted (in shares)							470,000	144,500
Stock Option Award Vesting Period								4 years
Number of Shares Authorized for Stock-Based Compensation Plan								3,500,000
Stock Option Issued under 2022 Heritage Global Inc. Equity Incentive Plan							470,000	144,500
2022 Stock Option Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding								$ 1.60
2022 Stock Option Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding								$ 3.55
2022 Stock Option Plan [Member] | Directors [Member] | On August 3, 2022 [Member] | Restricted Stock [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)		115,000
Common Stock [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)							75,767	242,475
Series N preferred stockholders to liquidation preference, conversion price per share								$ 1,000
Common Stock [Member] | On March 30, 2021 [Member]
Class Of Stock [Line Items]
Issuance of restricted common stock (in shares)			25,000
Preferred Stock [Member]
Class Of Stock [Line Items]
Convertible Preferred Stock, Shares Issuable upon Conversion							Each share of Series N preferred stock has a voting entitlement equal to 40 common shares, votes with the common stock on an as-converted basis and is senior to all other preferred stock of the Company. Dividends, if any, will be paid on an as-converted basis equal to common stock dividends. The conversion value of each share of Series N preferred stock is $1,000, and each share is convertible to 40 common shares at the rate of $25.00 per common share. The holders of shares of Series N preferred stock are entitled to liquidation preference over common stockholders equivalent to $1,000 per share.
Share price							$ 25
Conversion of series N preferred stock to shares of common stock							2	0
David Ludwig And Tom Ludwig [Member] | On June 1, 2018 [Member]
Class Of Stock [Line Items]
Issuance of restricted common stock (in shares)				600,000
Stock-based compensation expense							$ 21,500	$ 51,600
Weighted average grant date fair value							$ 0.43
Series N Preferred Stock [Member]
Class Of Stock [Line Items]
Series N preferred stock, each convertible to common shares							80