Annual report pursuant to Section 13 and 15(d)

Note 1 - Significant Accounting Policies (Details Textual)

v3.20.4
Note 1 - Significant Accounting Policies (Details Textual)
Pure in Thousands, $ in Thousands
 12 Months Ended
Apr. 15, 2020
USD ($)
Oct. 18, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Gas Balancing Asset (Liability)     $ 3,500 $ 3,600  
Impairment of Oil and Gas Properties     $ 0 0 $ 0
Proved Undeveloped Reserves Classification, Period to be Drilled (Year)     5 years    
Proceeds from Paycheck Protection Program Under CARES Act $ 8,400        
Increase (Decrease), Operating Lease Expense     $ (2,300)    
Increase (Decrease), General and Administrative Expense     4,200    
Increase (Decrease), Interest Expense, Net     1,900    
Gain (Loss) on Extinguishment of Debt, Total     47,469 $ (0) 47,109
Refinancing Transaction [Member]          
Gain (Loss) on Extinguishment of Debt, Total   $ 47,100     $ 47,100
Senior Second Lien Notes Due November 2023 [Member]          
Extinguishment of Debt, Amount     72,500    
Repayments of Long-term Debt, Total     23,900    
Gain (Loss) on Extinguishment of Debt, Total     $ 47,500    
Interest Rate Contract [Member]          
Derivative, Number of Instruments Held, Total     0 0 0
Furniture, Fixtures and Non-oil and Natural Gas Property and Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     5 years    
Furniture, Fixtures and Non-oil and Natural Gas Property and Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     7 years