Disposition of Assets and Other Expense (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2013 sqft	Jun. 01, 2013 sqft
Area of Land		200,000
Proceeds from Sale of Buildings		$ 16.0
Southfield MI [Member]
Area of Land	60,000	60,000
Proceeds from Sale of Buildings	$ 2.5	$ 2.5