Consolidated Statements of Shareholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Voting and Nonvoting Common Stock Voting and Nonvoting Common Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Balance, beginning of period at Dec. 31, 2014	$ 96,785	$ 71,774	$ (135)	$ 25,146
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,328
Other comprehensive loss	(1,103)		(1,103)
Dividends declared ($0.12 per share)	(546)			(546)
Recognition of the fair value of share-based compensation	458	458
Deferred stock rights issued in lieu of cash dividends payable on outstanding deferred stock rights	10	10
Excess tax benefit on share-based compensation	14	14
Common stock redeemed for the net settlement of share-based awards	(38)	(38)
Balance, end of period at Jun. 30, 2015	$ 99,908	$ 72,218	$ (1,238)	$ 28,928