Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Operating Leases (Details)

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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details)
 1 Months Ended 12 Months Ended 24 Months Ended
Jan. 01, 2018
USD ($)
Jun. 30, 2017
USD ($)
square_feet
Dec. 31, 2018
USD ($)
option
Dec. 31, 2017
USD ($)
Dec. 31, 2004
USD ($)
a
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]            
Rent expenses of operating lease     $ 4,200,000 $ 4,100,000    
Land lease of Silver Slipper Casino site | Land Lease Agreement            
Operating Leased Assets [Line Items]            
Percent of gross gaming revenue         3.00%  
Rent         $ 77,500  
Gross gaming revenue, more than         3,650,000  
Rent expenses of operating lease     1,500,000 1,400,000    
Contingent rental expense     600,000 500,000    
Option to purchase leased land         $ 15,500,000  
Retained interest in percentages of net income         3.00%  
Purchase option, retained interest in percent of net income, term         10 years  
New purchase price if change in ownership of Silver Slipper         $ 17,100,000  
Value of land purchase option         $ 2,000,000  
Land lease of Silver Slipper Casino site | Land Lease Agreement | Protected Marshland            
Operating Leased Assets [Line Items]            
Area of land | a         31  
Land lease of Silver Slipper Casino site | Land Lease Agreement | Casino parcel            
Operating Leased Assets [Line Items]            
Area of land | a         7  
Land subject to purchase option | a         4  
Bronco Billy's Casino and Hotel | Certain Parking Lots and Buildings            
Operating Leased Assets [Line Items]            
Option to purchase leased land     $ 7,600,000     $ 7,600,000
Number of renewal options | option     6      
Lease extension term     3 years     3 years
Bronco Billy's Casino and Hotel | Certain Parking Lots and Buildings | Lease Terms, Option One            
Operating Leased Assets [Line Items]            
Rent           $ 25,000
Bronco Billy's Casino and Hotel | Certain Parking Lots and Buildings | Lease Terms, Option Two            
Operating Leased Assets [Line Items]            
Rent     $ 30,000      
Grand Lodge Casino Facility            
Operating Leased Assets [Line Items]            
Rent $ 166,667     145,833    
Rent expenses of operating lease     $ 1,900,000 $ 1,900,000    
EBITDA measurement period     12 months      
Corporate Office            
Operating Leased Assets [Line Items]            
Rent   $ 200,000        
Area of office space (in square feet) | square_feet   4,479