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Note 5 - Debt (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
May 01, 2020
USD ($)
Jun. 28, 2018
USD ($)
Jun. 27, 2018
USD ($)
Amortization of Debt Issuance Costs $ 251 $ 251      
Credit Agreement [Member]          
Line of Credit Facility, Maximum Borrowing Capacity Including Additional Lenders 600,000        
Debt Instrument Covenant, Issued Qualified Senior Notes $ 200,000        
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Maximum Permitted Consolidated Total Leverage Ratio 4.75        
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Based on Occurence of Acquisition, Maximum Permitted Consolidated Total Leverage Ratio 5.25        
Debt Instrument Covenant, Specified Acquisition, Aggregate Consideration $ 15,000        
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Maximum Permitted Consolidated Total Leverage Ratio 5        
Debt Instrument Covenant, After Issuance of Qualified Senior Notes, Based on Occurence of Acquisition, Maximum Permitted Consolidated Total Leverage Ratio 5.5        
Debt Instrument Covenant, Maximum Permitted Consolidated Senior Secured Leverage Ratio 3.5        
Debt Instrument Covenant, Minimum Permitted Consolidated Interest Coverage Ratio 2.5        
Consolidated Total Leverage Ratio 4.27        
Consolidated Interest Coverage Ratio 4.52        
Long-term Debt, Total $ 271,600        
Debt Instrument Covenant, Default, Percentage of General Partner Interest Cease 100.00%        
Amortization of Debt Issuance Costs $ 300 $ 300      
Debt Instrument, Interest Rate During Period 4.90% 6.43%      
Interest Expense, Long-term Debt, Total $ 3,400 $ 4,300      
Credit Agreement [Member] | Ergon [Member]          
Debt Instrument Covenant, Default, Percentage of Membership Interest Cease 50.00%        
Credit Agreement [Member] | Federal Funds Effective Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.50%        
Credit Agreement [Member] | Eurodollar Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Credit Agreement [Member] | Minimum [Member]          
Line of Credit Facility, Commitment Fee Percentage 0.375%        
Credit Agreement [Member] | Minimum [Member] | Applicable Margin Based on Eurodollar Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Credit Agreement [Member] | Minimum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.00%        
Credit Agreement [Member] | Maximum [Member]          
Line of Credit Facility, Commitment Fee Percentage 0.50%        
Credit Agreement [Member] | Maximum [Member] | Applicable Margin Based on Eurodollar Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 3.25%        
Credit Agreement [Member] | Maximum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.25%        
Credit Agreement [Member] | Subsequent Event [Member]          
Line of Credit Facility, Remaining Borrowing Capacity     $ 127,400    
Credit Agreement [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity       $ 400,000 $ 450,000
Credit Agreement [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]          
Long-term Line of Credit, Total     270,600    
Credit Agreement [Member] | Letter of Credit [Member] | Subsequent Event [Member]          
Letters of Credit Outstanding, Amount     $ 2,000