Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2011 State of Michigan [Member]	Dec. 31, 2011 State of Illinois [Member]	Dec. 31, 2010 United Kingdom [Member]	Apr. 01, 2012 United Kingdom [Member]	Mar. 31, 2011 United Kingdom [Member]	Dec. 31, 2009 Ontario, Canada [Member]	Dec. 31, 2009 State of Wisconsin [Member]
Changes in tax laws on net earnings from continuing operations and net earnings per diluted common share
Tax Jurisdiction	State of Michigan	State of Illinois	United Kingdom			Ontario, Canada	State of Wisconsin
Enactment Date	May 25, 2011	Jan. 13, 2011	Jul. 27, 2010			Dec. 15, 2009	Feb. 19, 2009
Net Earnings	$ (5,350)	$ (1,221)	$ 400			$ 4,100	$ 513
Changes in U. K Tax Rate prior to enacted legislation				26.00%	27.00%
Changes in U. K Tax Rate subsequent to enacted legislation				25.00%	26.00%