Note 1 - Description of Business and Basis of Presentation (Details Textual)	3 Months Ended
	Mar. 31, 2018
Number of States in which Entity Operates	21
Number of Reportable Segments	1
Data [Member]
Number of Customers	651,550
Video [Member]
Number of Customers	350,874
Voice [Member]
Number of Customers	131,920