Consolidated Statements of Shareholders’ Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member] Employee Stock Option [Member]	Additional Paid-in Capital [Member] Stock Appreciation Rights (SARs) [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Employee Stock Option [Member]	Stock Appreciation Rights (SARs) [Member]	Total
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
Impact of 2:1 stock split	6,000			(6,000)
Impact of 2:1 stock split (in Shares)	6,115,907
Common shares issued upon exercise of options				2,216,000					2,216,000
Common shares issued upon exercise of options (in Shares)	412,882								412,882
Restricted shares issued	1,000			1,554,000					1,555,000
Restricted shares issued (in Shares)	417,234
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in Shares)	5,308
Share-based compensation expense				788,000					788,000
Tax benefit from exercise of share-based compensation		31,000					31,000
Purchase and retirement of common shares				(50,000)	(112,000)				(162,000)
Purchase and retirement of common shares (in Shares)	(26,422)								(26,422)
Cash dividends declared					(874,000)				(874,000)
Comprehensive Income (Loss):
Net earnings					5,850,000				5,850,000
Net change during the period related to:
Cash flow hedges, net of taxes						(85,000)			(85,000)
Pensions, net of taxes						4,828,000			4,828,000
Comprehensive Income:									10,593,000
Balance at Dec. 31, 2013	13,000			25,821,000	49,315,000	(3,214,000)			71,935,000
Balance (in Shares) at Dec. 31, 2013	13,040,816								13,040,816
Common shares issued upon exercise of options				1,855,000					1,855,000
Common shares issued upon exercise of options (in Shares)	319,502						40,816		360,318
Restricted shares issued				229,000					229,000
Restricted shares issued (in Shares)	106,016
Common shares issued upon exercise of Stock Appreciation Rights (SARs) (in Shares)	27,672
Share-based compensation expense				1,175,000					1,175,000
Tax benefit from exercise of share-based compensation		231,000	32,000				231,000	32,000
Common shares received as payment for exercise of stock options				158,000	(158,000)
Common shares received as payment for exercise of stock options (in Shares)	20,560
Purchase and retirement of common shares									0
Purchase and retirement of common shares (in Shares)									0
Cash dividends declared					(3,663,000)				(3,663,000)
Comprehensive Income (Loss):
Net earnings					11,349,000				11,349,000
Net change during the period related to:
Cash flow hedges, net of taxes						(26,000)			(26,000)
Pensions, net of taxes						(2,705,000)			(2,705,000)
Comprehensive Income:									8,618,000
Balance at Dec. 31, 2014	$ 13,000			$ 29,501,000	$ 56,843,000	$ (5,945,000)			$ 80,412,000
Balance (in Shares) at Dec. 31, 2014	13,514,566								13,514,566