Note 3 - Acquisitions - Identifiable Intangible Assets Acquired (Details) - USD ($) $ in Millions	Oct. 01, 2019	Jan. 08, 2019	May 01, 2017
New Wave [Member] | Franchise Agreements [Member]
Fair Value			$ 315.0
Clearwave [Member] | Trade Names [Member]
Fair Value		$ 6.7
Fidelity [Member]
Useful Life (Year)	13 years 8 months 12 days
Fidelity [Member] | Franchise Agreements [Member]
Fair Value	$ 166.0
Customer Relationships [Member] | New Wave [Member]
Fair Value			$ 160.0
Useful Life (Year)			14 years
Customer Relationships [Member] | Clearwave [Member]
Fair Value		$ 83.0
Useful Life (Year)		17 years
Customer Relationships [Member] | Fidelity [Member]
Fair Value	$ 119.0
Useful Life (Year)	14 years
Trademarks and Trade Names [Member] | New Wave [Member]
Fair Value			$ 1.3
Useful Life (Year)			3 years
Trademarks and Trade Names [Member] | Fidelity [Member]
Fair Value	$ 3.0
Useful Life (Year)	3 years