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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Feb. 26, 2016
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Common Stock, Dividends, Per Share, Declared $ 0.05    
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at the beginning of the period   $ 82,569 $ 76,016
Exercise of stock options   293 20
Stock Repurchased and Retired During Period, Value   (404) 0
Stock Options Repurchased During Period, Value   (1,752) 0
Proceeds from stock purchase plan   25 0
Dividends   (459) (319)
Share-based compensation - options   143 238
Share-based compensation - ESPP   5 0
Tax benefit - stock option exercises   563 7
Unrealized gain or loss on investments, net of tax   121 55
Foreign currency translation adjustment   33 (180)
Net Income during the period   1,368 1,272
Balance at end of the period   $ 82,505 $ 77,109