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Note 10 - Long-term Debt (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2020
USD ($)
Mar. 27, 2020
USD ($)
Nov. 21, 2019
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2024
USD ($)
May 31, 2023
USD ($)
Mar. 31, 2020
USD ($)
Mar. 26, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term Debt, Excluding Current Maturities, Total       $ 130,000   $ 130,000           $ 170,000
Long-term Line of Credit, Total       $ 93,900   93,900            
Repayments of Lines of Credit           $ 133,900            
Long-term Debt, Weighted Average Interest Rate, over Time       2.48% 4.38% 2.89% 4.53%          
Line of Credit Facility, Commitment Fee Amount       $ 200 $ 200 $ 500 $ 500          
Amortization of Debt Issuance Costs       100 100 241 336          
Interest Rate Swap [Member]                        
Derivative, Fixed Interest Rate                   0.286%    
Derivative, Notional Amount                   $ 125,000    
Interest Rate Swap [Member] | Forecast [Member]                        
Derivative, Notional Amount               $ 75,000 $ 100,000      
Earthstone Energy Holdings Credit Agreement [Member]                        
Line of Credit Facility, Current Borrowing Capacity $ 240,000 $ 275,000                 $ 325,000  
Line of Credit Facility Increase (Decrease) in Current Borrowing Base, Percent   15.00%                    
Line Of Credit Facility, Covenant Terms, Minimum Current Ratio     1.0                  
Line Of Credit Facility, Covenant Terms, Maximum Leverage Ratio     4.0                  
Long-term Debt, Excluding Current Maturities, Total       $ 130,000   $ 130,000           $ 170,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate       2.658%   2.658%            
Line of Credit Facility, Remaining Borrowing Capacity       $ 110,000   $ 110,000            
Capitalized Deferred Finance Costs       $ 0 $ 0 $ 0 $ 0          
Earthstone Energy Holdings Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument, Basis Spread on Variable Rate           1.00%            
Earthstone Energy Holdings Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]                        
Debt Instrument, Basis Spread on Variable Rate           1.00%            
Earthstone Energy Holdings Credit Agreement [Member] | Minimum [Member]                        
Debt Instrument, Increase (Decrease) in Interest Rate 0.25%                      
Debt Instrument, Basis Spread on Variable Rate           1.00%            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.375%            
Earthstone Energy Holdings Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument, Basis Spread on Variable Rate           2.00%            
Earthstone Energy Holdings Credit Agreement [Member] | Maximum [Member]                        
Debt Instrument, Increase (Decrease) in Interest Rate 0.50%                      
Debt Instrument, Basis Spread on Variable Rate           2.25%            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.50%            
Earthstone Energy Holdings Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument, Basis Spread on Variable Rate           3.25%