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Note 10 - Commitments and Contingencies (Details Textual)
1 Months Ended 3 Months Ended
May 31, 2021
bbl
Mar. 31, 2022
USD ($)
bbl
MMBbls
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
a
Oncor [Member]        
Letters of Credit Outstanding, Amount       $ 1,900,000
TEXAS        
Area of Land (Acre) | a       80
The Salt-Water Disposal Agreement Due on July 24, 2022 [Member]        
Number of Barrels to be Delivered (Million Barrels of Oil) | MMBbls   3,000,000.0    
Number of Barrels, Delivered (Million Barrels of Oil) | MMBbls   2.7    
Supply Commitment, Remaining Minimum Amount Committed   $ 114,000    
Crude Oil Delivery Commitments [Member]        
Number of Barrels, Delivered (Million Barrels of Oil) | bbl   15,141    
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Year One (Barrel of Oil) | bbl 5,000      
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Year Two (Barrel of Oil) | bbl 7,500      
Supply Commitment, Gross Barrels of Oil Delivered Per Day, Remaining Term of Contract (Barrel of Oil) | bbl 10,000      
Supply Commitment, Remaining Term of Contract (Year) 8 years      
Supply Commitment, Amount Committed   $ 23,600,000    
Sand Commitments [Member]        
Supply Commitment, Amount Committed   $ 8,700,000    
Supply Commitment, Minimum Tons of Sand   600,000    
Other Noncurrent Assets [Member]        
Operating Lease, Right-of-Use Asset   $ 715,000 $ 852,000  
Other Liabilities [Member]        
Operating Lease, Liability, Total   723,000 856,000  
Other Current Liabilities [Member]        
Operating Lease, Liability, Noncurrent   493,000 513,000  
Other Noncurrent Liabilities [Member]        
Operating Lease, Liability, Noncurrent   $ 230,000 $ 343,000