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Subsequent Events - Additional Information (Details)
 12 Months Ended
Dec. 04, 2020
USD ($)
a
Nov. 12, 2020
USD ($)
a
Oct. 08, 2020
USD ($)
a
shares
Jun. 24, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 23, 2020
USD ($)
Revolving Credit Facility [Member]            
Subsequent Event [Line Items]            
Borrowing base of credit facility, quarterly reduction amount       $ 1,000,000    
Borrowing base of credit facility, quarterly reduction term description         Quarterly Commitment Reduction, whereby the borrowing base is reduced by $1,000,000 each April 15, July 15, October 15 and January 15, commencing on July 15, 2020.  
Funded debt to EBITDA ratio         400.00%  
Borrowing base of credit facility       32,000,000 $ 31,000,000 $ 45,000,000
Revolving Credit Facility [Member] | Eighth Amendment to the Credit Facility [Member]            
Subsequent Event [Line Items]            
Borrowing base of credit facility, quarterly reduction amount       1,000,000    
Borrowing base of credit facility, quarterly reduction term description         This amendment reduced the Quarterly Commitment Reductions from $1,000,000 to $600,000  
Consolidated cash balance in anti-cash hoarding provision       $ 2,000,000    
Funded debt to EBITDA ratio       400.00%    
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Purchase price of mineral acreage acquired     $ 5,500,000      
Shares issued as consideration | shares     153,375      
Common stock offering closing date     Sep. 01, 2020      
Subsequent Event [Member] | Revolving Credit Facility [Member] | Eighth Amendment to the Credit Facility [Member]            
Subsequent Event [Line Items]            
Borrowing base of credit facility, quarterly reduction amount $ 600,000          
Consolidated cash balance in anti-cash hoarding provision $ 1,000,000          
Funded debt to EBITDA ratio 350.00%          
Borrowing base of credit facility $ 30,000,000          
Subsequent Event [Member] | Grady County, Oklahoma [Member]            
Subsequent Event [Line Items]            
Royalty acres acquired | a     297      
Subsequent Event [Member] | Harrison, Panola [Member]            
Subsequent Event [Line Items]            
Mineral acreage acquired | a     257      
Subsequent Event [Member] | Nacogdoches Counties, Texas [Member]            
Subsequent Event [Line Items]            
Royalty acres acquired | a     12      
Subsequent Event [Member] | San Augustine County, Texas [Member]            
Subsequent Event [Line Items]            
Mineral acreage acquired | a 87 134        
Purchase price of mineral acreage acquired $ 1,000,000 $ 750,000        
Purchase and sales agreement date Dec. 04, 2020