Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.2.0.727
Subsequent Events (Details)
Sep. 23, 2015
USD ($)
Sep. 11, 2015
USD ($)
$ / shares
May. 01, 2015
$ / shares
Sep. 10, 2015
USD ($)
institutional_participant
Aug. 28, 2015
ft²
$ / ft²
Jul. 23, 2015
USD ($)
Jul. 10, 2015
USD ($)
Jul. 09, 2015
USD ($)
Jul. 08, 2015
USD ($)
institutional_participant
Jun. 30, 2015
USD ($)
Jun. 09, 2015
USD ($)
Apr. 01, 2015
USD ($)
Jan. 23, 2015
USD ($)
Nov. 21, 2014
ft²
Oct. 09, 2014
USD ($)
Jul. 02, 2014
USD ($)
Jun. 30, 2014
USD ($)
Jun. 18, 2014
USD ($)
Jun. 05, 2014
USD ($)
Subsequent Event [Line Items]                                      
Line of credit, maximum borrowing capacity                   $ 0         $ 16,000,000.0        
Short term loan receivable                   0 $ 4,100,000 $ 2,400,000 $ 3,100,000     $ 3,700,000 $ 2,600,000   $ 3,800,000
Dividend declared (usd per share) | $ / shares     $ 0.05                                
Subsequent Event                                      
Subsequent Event [Line Items]                                      
Dividend declared (usd per share) | $ / shares   $ 0.05                                  
Las Vegas, Nevada                                      
Subsequent Event [Line Items]                                      
Area under lease | ft²                           14,000          
Las Vegas, Nevada | Subsequent Event                                      
Subsequent Event [Line Items]                                      
Area under lease, increase | ft²         3,600                            
Area under lease | ft²         17,600                            
Rent expense (usd per sqft) | $ / ft²         1.50                            
Trading credit facility | Subsequent Event                                      
Subsequent Event [Line Items]                                      
Line of credit, maximum borrowing capacity   $ 40,000,000.0   $ 35,000,000.0                              
Line of Credit | Trading credit facility | Subsequent Event                                      
Subsequent Event [Line Items]                                      
Number of institutional participants requested to terminate credit demand line | institutional_participant                 1                    
Number of institutional participants | institutional_participant       5         6                    
Line of credit, terminated                 $ 40,000,000.0                    
Number of institutional participants increased credit demand line | institutional_participant       1                              
Line of credit, maximum borrowing capacity $ 205,000,000.0 $ 40,000,000.0   $ 35,000,000.0     $ 45,000,000.0 $ 35,000,000.0                      
Stack Bowers Galleries                                      
Subsequent Event [Line Items]                                      
Short term loan receivable                   $ 0               $ 2,600,000  
Stack Bowers Galleries | Line of Credit                                      
Subsequent Event [Line Items]                                      
Line of credit, maximum borrowing capacity                             $ 16,000,000.0        
Stack Bowers Galleries | Line of Credit | Subsequent Event                                      
Subsequent Event [Line Items]                                      
Line of credit, maximum borrowing capacity           $ 2,500,000.0                          
Repayments of secured debt $ 1,800,000