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Note 10 - Net Income Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income $ 33,215 $ 27,044
Basic (in shares) [1] 5,671,838 5,796,252
Effect of dilutive equity awards (1) (in shares) [2] 59,063 14,387
Weighted average common shares outstanding - Diluted (in shares) [1] 5,730,901 5,810,639
Net income per common share:    
Basic (in dollars per share) [1] $ 5.86 $ 4.67
Diluted (in dollars per share) [1] $ 5.80 $ 4.65
[1] On July 1, 2015, Graham Holdings Company distributed 5,843,313 shares of Cable One, Inc. common stock to existing holders of Graham Holdings Company common stock. Basic and diluted net income per common share for the year ended December 31, 2014 are calculated using the number of shares distributed on July 1, 2015.
[2] SARs outstanding that were not included in the diluted net income per share calculation because the effect would have been anti-dilutive were 443 and 1,038 for the three months ended March 31, 2017 and 2016, respectively.