Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2019	Jan. 31, 2019	Dec. 31, 2019	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2019	Jan. 08, 2019
Goodwill, Ending Balance			$ 429,597		$ 429,597	$ 172,129
Goodwill, Impairment Loss				$ 0	0	0
Amortization of Intangible Assets, Total					19,200	$ 11,700	$ 8,000
Clearwave [Member]
Goodwill, Ending Balance			185,885		185,885				$ 183,218
Goodwill, Acquired During Period		$ 185,900
Fidelity [Member]
Goodwill, Ending Balance			71,583		$ 71,583			$ 69,306
Goodwill, Acquired During Period	$ 71,600
Amortization of Intangible Assets, Total			$ 2,400