Restructuring Charges (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ (100,000)	$ 0	$ (49,000)
Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				51,000
Closing of Syracuse China Manufacturing Facility [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				51,000
Other Restructuring [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				167,000
Building site clean-up & fixed asset write-down [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				(116,000)
Glass Operations [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
Glass Operations [Member] | Closing of Syracuse China Manufacturing Facility [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
Glass Operations [Member] | Outsource U.S. Decorating Business [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(100,000)		(100,000)
Glass Operations [Member] | Other Restructuring [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
Glass Operations [Member] | Building site clean-up & fixed asset write-down [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
Other Operations [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				51,000
Other Operations [Member] | Closing of Syracuse China Manufacturing Facility [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		51,000
Other Operations [Member] | Other Restructuring [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				167,000
Other Operations [Member] | Building site clean-up & fixed asset write-down [Member] | Closing of Syracuse China Manufacturing Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ (116,000)