Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011
Property, Plant and equipment
Property, plant and equipment, Gross	$ 139,616	$ 140,648	$ 141,678
Less- Accumulated depreciation and amortization	(111,335)	(111,066)	(110,728)
Net Property, plant and equipment	28,281	29,582	30,950
Land [Member]
Property, Plant and equipment
Property, plant and equipment, Gross	2,508	2,508	2,508
Buildings, leasehold interests and improvements [Member]
Property, Plant and equipment
Property, plant and equipment, Gross	36,902	37,064	37,645
Machinery, equipment and other [Member]
Property, Plant and equipment
Property, plant and equipment, Gross	$ 100,206	$ 101,076	$ 101,525

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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