Note 1 - Description of Business (Details Textual) $ in Millions	Oct. 01, 2019 USD ($)	Jan. 08, 2019 USD ($)	May 01, 2017 USD ($)	Dec. 31, 2019
Number of States in which Entity Operates				21
Number of Customers				907,000
New Wave [Member]
Payments to Acquire Businesses, Gross			$ 740.2
Clearwave [Member]
Payments to Acquire Businesses, Gross		$ 358.8
Fidelity [Member]
Payments to Acquire Businesses, Gross	$ 531.4
Data [Member]
Number of Customers				773,000
Video [Member]
Number of Customers				314,000
Voice [Member]
Number of Customers				139,000