Note 13 - Goodwill and Other Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-lived intangible assets, gross	$ 151.9	$ 153.9
Less accumulated amortization	(61.3)	(47.1)
Total identifiable intangible assets, net	90.6	106.8
Customer Relationships [Member]
Finite-lived intangible assets, gross	$ 129.9	131.7
Weighted average amortization period (Year)	11 years 1 month 6 days
Noncompete Agreements [Member]
Finite-lived intangible assets, gross	$ 7.3	7.9
Weighted average amortization period (Year)	6 years 8 months 12 days
Trade Names [Member]
Finite-lived intangible assets, gross	$ 4.2	3.8
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