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Note 4 - Long-term Debt (Details Textual)
3 Months Ended 9 Months Ended
Jan. 01, 2022
Nov. 13, 2019
USD ($)
Jun. 20, 2018
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
Dec. 31, 2019
USD ($)
Long-term Debt, Total       $ 199,081,000   $ 192,718,000
Line of Credit [Member] | First Lien Credit Facility [Member]            
Long-term Line of Credit, Total       102,000,000    
Line of Credit Facility, Maximum Borrowing Capacity       200,000,000    
Line of Credit Facility, Current Borrowing Capacity       $ 135,000,000    
Debt Instrument, Spread on Elected Variable Rate       0.50%    
Debt Instrument, Debt Default, Basis Spread on Variable Rate       3.00%    
Line of Credit Facility, Interest Rate at Period End       4.80%    
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 of Proven Reserves Required       90.00%    
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 of PDP Reserves Required       95.00%    
Financial Covenants, Minimum Current Ratio       1    
Financial Covenants, Interest Coverage Ratio       2.5    
Financial Covenants, Total Debt to EBITDAX Ratio       3.5    
Line of Credit [Member] | First Lien Credit Facility [Member] | Forecast [Member]            
Financial Covenants, Minimum Asset Coverage Ratio 1.55       1.45  
Line of Credit [Member] | First Lien Credit Facility [Member] | Minimum [Member]            
Debt Instrument, Spread on Elected Variable Rate       2.50%    
Debt Instrument, Basis Spread on Variable Rate       1.50%    
Line of Credit [Member] | First Lien Credit Facility [Member] | Maximum [Member]            
Debt Instrument, Spread on Elected Variable Rate       3.50%    
Debt Instrument, Basis Spread on Variable Rate       2.50%    
Line of Credit [Member] | Second Lien Credit Facility [Member]            
Long-term Line of Credit, Total       $ 100,000,000    
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000,000        
Debt Instrument, Spread on Elected Variable Rate       0.50%    
Line of Credit Facility, Interest Rate at Period End           10.90%
Financial Covenants, Minimum Current Ratio   1        
Financial Covenants, Total Debt to EBITDAX Ratio   4        
Proceeds from Lines of Credit, Total   $ 95,000,000        
Debt Instrument Reference Rate Floor       2.75%    
Debt Instrument Eurodollar Rate Floor       1.75%    
Line of Credit, Default, Minimum Interest Rate   3.00%        
Debt Instrument, Original Issue Discount   3.50%        
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 Proven Reserves   90.00%        
Debt Instrument, Collateral Eligible, Minimum Percent of PV-9 Required PDP Reserves   95.00%        
Financial Covenants, Minimum Asset Coverage Ratio in Year One   1.25        
Financial Covenants, Minimum Asset Coverage Ratio in Year Two   1.45        
Financial Covenants, Minimum Asset Coverage Ratio Thereafter   1.55        
Line of Credit [Member] | Second Lien Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate       8.00%    
Line of Credit [Member] | Second Lien Credit Facility [Member] | Company's Reference Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate       8.00%    
Line of Credit [Member] | Second Lien Credit Facility [Member] | Eurodollar [Member]            
Debt Instrument, Spread on Elected Variable Rate       9.00%    
Line of Credit [Member] | Second Lien Credit Facility [Member] | Debt Instrument Spread On Elected Variable Rate [Member]            
Debt Instrument, Spread on Elected Variable Rate       9.00%    
Construction Loans [Member]            
Debt Instrument, Interest Rate, Stated Percentage     4.90%      
Debt Instrument, Periodic Payment, Total     $ 35,672      
Long-term Debt, Total       $ 3,000,000   $ 3,100,000