Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 35,214,000   $ 35,082,000
Less, accumulated depreciation (30,775,000)   (30,249,000)
Total property, plant and equipment, net 4,439,000   4,833,000
Depreciation expense 600,000 600,000  
Machinery, rental equipment, equipment, automobiles and furniture
     
Property, Plant and Equipment      
Total property, plant and equipment, gross 20,617,000   20,506,000
Leasehold improvements
     
Property, Plant and Equipment      
Total property, plant and equipment, gross 9,694,000   9,696,000
Molds and tooling
     
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 4,903,000   $ 4,880,000