Plant and Equipment (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 46,316,000	$ 47,440,000
Less accumulated depreciation and amortization	(32,233,000)	(34,702,000)
Total	14,083,000	12,738,000
Foreign Countries [Member]
Property, Plant and Equipment [Line Items]
Total	6,233,000	6,320,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	26,991,000	30,802,000
Office Equipment and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,780,000	8,251,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,912,000	7,761,000
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 633,000	$ 626,000

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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