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Note 10 - Goodwill and Other Intangible Assets - Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Finite-lived intangible assets, gross $ 195.5 $ 151.9
Less accumulated amortization (74.7) (61.3)
Total identifiable intangible assets, net 120.8 90.6
Customer Relationships [Member]    
Finite-lived intangible assets, gross $ 169.0 129.9
Weighted average amortization period (Year) 10 years 9 months 18 days  
Noncompete Agreements [Member]    
Finite-lived intangible assets, gross $ 9.6 7.3
Weighted average amortization period (Year) 6 years 3 months 18 days  
Trade Names [Member]    
Finite-lived intangible assets, gross $ 6.4 4.2
Weighted average amortization period (Year) 2 years 1 month 6 days  
LDC Network Access [Member]    
Finite-lived intangible assets, gross $ 10.5 $ 10.5
Weighted average amortization period (Year) 10 years