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Note 7 - Long-term Debt (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Feb. 28, 2022
Oct. 01, 2021
Jun. 30, 2021
Long-term Debt, Total $ 0 $ 97,929,000 $ 0      
Senior Unsecured Notes Due 2024 [Member] | Subsequent Event [Member]            
Debt Instrument, Face Amount       $ 225,000,000.0    
Debt Instrument, Interest Rate, Stated Percentage       10.00%    
Revolving Credit Facility [Member]            
Debt Issuance Costs, Gross   2,600,000        
Long-term Debt, Gross 0 100,000,000 0      
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member]            
Line of Credit Facility, Maximum Borrowing Capacity 40,000,000.0   40,000,000.0   $ 195,000,000.0 $ 125,000,000.0
Line of Credit Facility, Commitment Fee Amount 20,000,000.0          
Line of Credit Facility, Current Borrowing Capacity 20,000,000.0 195,000,000.0 20,000,000.0   $ 195,000,000.0 $ 125,000,000.0
Debt Instrument, Face Amount   500,000,000.0        
Long-term Debt, Gross 0 $ 100,000,000.0 $ 0      
Debt Instrument, Interest Rate, Effective Percentage   3.75%        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.50%        
Debt Instrument, Covenant, Minimum Cash Threshold for Prepayment to be Due   $ 20,000,000.0        
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member] | Maximum [Member]            
Debt Instrument, Covenant, Maximum Total Debt to EBITDAX Ratio   3.00        
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member] | Minimum [Member]            
Debt Instrument, Covenant, Minimum Current Ratio   1.00        
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate     0.50%      
Revolving Credit Facility [Member] | Fifth Third Bank, National Association [Member] | Subsequent Event [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 138,800,000    
Line of Credit Facility, Current Borrowing Capacity       $ 138,800,000    
Letter of Credit [Member] | Fifth Third Bank, National Association [Member] | London Interbank Offered Rate (LIBOR), Applicable Margin [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.125%        
Other Noncurrent Assets [Member]            
Debt Issuance Costs, Gross 401,000 $ 2,600,000 $ 401,000      
Accumulated Amortization, Debt Issuance Costs $ 4,000 $ 502,000 $ 4,000