CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 16,139	$ 152,706	$ (2,533)	$ 166,312
Balance (in shares) at Dec. 31, 2008	23,605
Comprehensive income:
Net income	0	15,092	0	15,092
Reclassification adjustment for unrealized loss from pension plans included in net income, net of tax	0	0	55	55
Net unrealized gain from pension plans, net of tax	0	0	30	30
Total comprehensive income				15,177
Dividends declared	0	(7,568)	0	(7,568)
Dividends reinvested in common stock	560	0	0	560
Dividends reinvested in common stock (in shares)	32
Stock based compensation	676	0	0	676
Conversion of liability classified awards to equity classified awards	85	0	0	85
Common stock issued through exercise of incentive stock options	367	0	0	367
Common stock issued through exercise of incentive stock options (in shares)	44
Net excess tax benefit from stock options exercised	63	0	0	63
Balance at Dec. 31, 2009	17,890	160,230	(2,448)	175,672
Balance (in shares) at Dec. 31, 2009	23,681
Comprehensive income:
Net income	0	18,075	0	18,075
Reclassification adjustment for unrealized loss from pension plans included in net income, net of tax	0	0	2,596	2,596
Net unrealized gain from pension plans, net of tax	0	0	(148)	(148)
Total comprehensive income				20,523
Dividends declared	0	(7,833)	0	(7,833)
Dividends reinvested in common stock	520	0	0	520
Dividends reinvested in common stock (in shares)	29
Stock based compensation	792	0	0	792
Common stock issued through exercise of incentive stock options	561	0	0	561
Common stock issued through exercise of incentive stock options (in shares)	57
Net excess tax benefit from stock options exercised	70	0	0	70
Balance at Dec. 31, 2010	19,833	170,472	0	190,305
Balance (in shares) at Dec. 31, 2010	23,767			23,767
Comprehensive income:
Net income	0	12,993	0	12,993
Total comprehensive income				12,993
Dividends declared	0	(7,849)	0	(7,849)
Dividends reinvested in common stock	529	0	0	529
Dividends reinvested in common stock (in shares)	51
Stock based compensation	1,718	0	0	1,718
Common stock issued through exercise of incentive stock options	37	0	0	37
Common stock issued through exercise of incentive stock options (in shares)	5
Common stock issued for share awards	0	0	0	0
Common stock issued for share awards (in shares)	19
Common stock issued	13	0	0	13
Common stock issued (in shares)	1
Common stock repurchased	(92)	0	0	(92)
Common stock repurchased (in shares)	(5)
Net excess tax benefit from stock options exercised	5	0	0	5
Balance at Dec. 31, 2011	$ 22,043	$ 175,616	$ 0	$ 197,659
Balance (in shares) at Dec. 31, 2011	23,838			23,838