XML 40 R50.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Related Party Transactions (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
ft²
$ / ft²
shares
Dec. 31, 2018
USD ($)
shares
Investment Advisory Services [Abstract]    
Receivable from related parties $ 3,940,000 $ 4,194,000
Associated Capital Group, Inc. [Member]    
Capital Lease [Abstract]    
Area of lease space (in square feet) | ft² 13,800  
Sublease rental base rate (in dollars per square foot) | $ / ft² 22.32  
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3  
Sublease rental base rate $ 485,333 $ 463,286
Investment Advisory Services [Abstract]    
Rent paid $ 29,100  
Common Class A [Member] | Associated Capital Group, Inc. [Member]    
Related Party Transaction [Line Items]    
Ownership percentage of voting rights 1.00% 2.00%
Percentage of ownership 11.00% 10.00%
Shares owned by related party (in shares) | shares 2,935,401 3,016,501
GGCP Holdings LLC [Member] | Common Class B [Member]    
Related Party Transaction [Line Items]    
Ownership percentage of voting rights 92.00% 91.00%
Percentage of ownership 67.00% 63.00%
GCI [Member] | Fund Advisor [Member] | Advisory Fees [Member]    
Investment Advisory Services [Abstract]    
Revenue from related parties $ (7,600,000) $ (3,900,000)
Percentage of net revenue paid to related party 90.00%  
Entity Controlled by Members of Chairman's Family [Member]    
Capital Lease [Abstract]    
Area of lease space (in square feet) | ft² 60,000  
LICT Corporation [Member]    
Capital Lease [Abstract]    
Area of lease space (in square feet) | ft² 3,300  
Sublease rental base rate (in dollars per square foot) | $ / ft² 28  
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3  
Sublease rental base rate $ 115,573 118,957
Teton [Member]    
Capital Lease [Abstract]    
Area of lease space (in square feet) | ft² 1,600  
Sublease rental base rate (in dollars per square foot) | $ / ft² 37.75  
Sublease rental rate for utilities and taxes on sublease property (in dollars per square foot) | ft² 3  
Sublease rental base rate $ 67,752 69,299
MJG Associates, Inc [Member] | G B L [Member] | Advisory Fees [Member]    
Investment Advisory Services [Abstract]    
Revenue from related parties 10,000 10,000
Affiliated Funds [Member] | G.distributors, LLC [Member] | Advisory and Distribution Fees [Member]    
Investment Advisory Services [Abstract]    
Receivable from related parties 31,000,000 18,800,000
Affiliated Funds [Member] | G.distributors, LLC [Member] | Distribution Fees [Member]    
Investment Advisory Services [Abstract]    
Revenue from related parties $ 29,200,000 $ 35,100,000