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Note 8 - Debt (Details Textual) - Credit Agreement [Member]
$ in Millions
12 Months Ended
May 26, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 01, 2022
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity Including Additional Lenders   $ 450.0  
Debt Instrument Covenant, Issued Qualified Senior Notes   $ 200.0  
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   $ 15.0  
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Maximum Permitted Consolidated Total Leverage Ratio   5.00  
Debt Instrument Covenant, After Issuance of Qualified Senior Notes, Based on Occurence of Acquisition, Maximum Permitted Consolidated Total Leverage Ratio   5.50  
Debt Instrument Covenant, Maximum Permitted Consolidated Senior Secured Leverage Ratio   3.50  
Debt Instrument Covenant, Minimum Permitted Consolidated Interest Coverage Ratio   2.50  
Consolidated Total Leverage Ratio   1.84  
Consolidated Interest Coverage Ratio   15.79  
Debt Instrument, Covenant, Maximum Aggregate Unit Repurchases   $ 40.0  
Debt Instrument, Covenant, Maximum Yearly Unit Repurchases   $ 10.0  
Debt Instrument, Covenant, Unit Repurchases, Maximum Total Leverage Ratio   4.00  
Debt Instrument, Covenant, Unit Repurchases, Minimum Percentage of Revolving Credit Facility to Total Commitments   20.00%  
Debt Instrument Covenant, Default, Percentage of General Partner Interest Cease   100.00%  
Line of Credit Assumed $ 2.9    
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction 2.5    
Ergon [Member]      
Debt Instrument Covenant, Default, Percentage of Membership Interest Cease   50.00%  
Federal Funds Effective Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   0.50%  
Eurodollar Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.00%  
Minimum [Member]      
Line of Credit Facility, Commitment Fee Percentage   0.375%  
Minimum [Member] | Applicable Margin Based on Eurodollar Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.00%  
Minimum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.00%  
Maximum [Member]      
Line of Credit Facility, Commitment Fee Percentage   0.50%  
Maximum [Member] | Applicable Margin Based on Eurodollar Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   3.25%  
Maximum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.25%  
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 300.0    
Revolving Credit Facility [Member] | Subsequent Event [Member]      
Long-term Line of Credit, Total     $ 110.0
Letters of Credit Outstanding, Amount     0.6
Line of Credit Facility, Remaining Borrowing Capacity     $ 189.4