Annual report pursuant to Section 13 and 15(d)

Note 1 - Significant Accounting Policies (Details Textual)

v3.19.3.a.u2
Note 1 - Significant Accounting Policies (Details Textual)
xbrli-pure in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Oct. 18, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Gas Balancing Asset (Liability)   $ (4,100) $ (3,600) $ (4,100)    
Impairment of Oil and Gas Properties     $ 0 0 $ 0  
Proved Undeveloped Reserves Classification, Period to be Drilled     5 years      
Gain (Loss) on Extinguishment of Debt, Total   $ 47,100 47,109 $ 7,811  
Refinancing Transaction [Member]            
Gain (Loss) on Extinguishment of Debt, Total $ 47,100     $ 47,100    
11.00% 1.5 Lien Term Loan Due November 2019 [Member]            
Interest Expense, Debt, Total           $ 0
Interest Rate Contract [Member]            
Derivative, Number of Instruments Held, Total   0 0 0 0  
Furniture, Fixtures and Non-oil and Natural Gas Property and Equipment [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life     5 years      
Furniture, Fixtures and Non-oil and Natural Gas Property and Equipment [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life     7 years