Consolidated Statements of Shareholders’ Equity and Comprehensive Income (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2010	$ 6,000	$ 16,753,000	$ 48,403,000	$ (4,062,000)	$ 61,100,000
Balance (in Shares) at Dec. 31, 2010	5,959,975
Comprehensive Income (Loss):
Net earnings			4,136,000		4,136,000
Net change during the period related to:
Pensions, net of tax benefit				(2,835,000)	(2,835,000)
Comprehensive Income					1,301,000
Common shares issued upon exercise of options		1,056,000			1,056,000
Common shares issued upon exercise of options (in Shares)	117,846				117,846
Common shares issued upon exercise of Stock Appreciation Rights (in Shares)	425
Share-based compensation expense		1,005,000			1,005,000
Warrants issued		800,000			800,000
Common shares received as payment for stock options		(26,000)	(73,000)		(99,000)
Common shares received as payment for stock options (in Shares)	(8,491)
Purchase and retirement of common shares		(241,000)	(641,000)		(882,000)
Purchase and retirement of common shares (in Shares)	(76,693)				(76,693)
Cash dividends declared			(3,235,000)		(3,235,000)
Balance at Dec. 31, 2011	6,000	19,347,000	48,590,000	(6,897,000)	61,046,000
Balance (in Shares) at Dec. 31, 2011	5,993,062				5,993,062
Comprehensive Income (Loss):
Net earnings			3,031,000		3,031,000
Net change during the period related to:
Pensions, net of tax benefit				(1,060,000)	(1,060,000)
Comprehensive Income					1,971,000
Common shares issued upon exercise of options		889,000			889,000
Common shares issued upon exercise of options (in Shares)	138,252				138,252
Common shares issued upon exercise of Stock Appreciation Rights (in Shares)	10,324
Warrants exercised (in Shares)	44,912
Share-based compensation expense		893,000			893,000
Common shares received as payment for stock options		282,000	(282,000)
Common shares received as payment for stock options (in Shares)	(34,073)
Purchase and retirement of common shares		(123,000)	(314,000)		(437,000)
Purchase and retirement of common shares (in Shares)	(36,570)				(36,570)
Cash dividends declared			(6,574,000)		(6,574,000)
Balance at Dec. 31, 2012	$ 6,000	$ 21,288,000	$ 44,451,000	$ (7,957,000)	$ 57,788,000
Balance (in Shares) at Dec. 31, 2012	6,115,907				6,115,907