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Note 1 - Separation from Graham Holdings Company and Description of Business (Details Textual)
Mar. 31, 2016
shares
Dec. 31, 2015
shares
Jul. 02, 2015
Jun. 30, 2015
shares
Spinoff [Member] | Common Class A [Member]        
Conversion of Holding Company Stock to new Reporting Entity, Outstanding Number       960,000
Spinoff [Member] | Common Class B [Member]        
Conversion of Holding Company Stock to new Reporting Entity, Outstanding Number       4,880,000
Spinoff [Member]        
Preferred Stock, Shares Issued       0
Preferred Stock, Shares Outstanding       0
Common Stock, Shares, Outstanding       5,840,000
Equity Method Investment, Ownership Percentage     100.00%  
Common Stock, Shares, Issued       5,840,000
Data [Member]        
Number of Customers 508,424      
Video [Member]        
Number of Customers 350,576      
Voice [Member]        
Number of Customers 123,910      
Number of States in which Entity Operates 19      
Common Stock, Shares, Outstanding 5,757,121 5,833,442    
Common Stock, Shares, Issued 5,886,163 5,879,925