Note 10 - Leases (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Lessee, Operating Lease, Lease Not yet Commenced, Present Value	$ 10,550
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)	20 years
Minimum [Member]
Connect America Fund Phase II services, Term (Year)	7 years
Maximum [Member]
Connect America Fund Phase II services, Term (Year)	25 years