Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 35,290,000 $ 35,082,000  
Less, accumulated depreciation (31,747,000) (30,249,000)  
Total property, plant and equipment, net 3,543,000 4,833,000  
Depreciation expense 2,300,000 2,600,000 2,800,000
Minimum
      
Property, Plant and Equipment      
Estimated Useful Life 2 years    
Maximum
      
Property, Plant and Equipment      
Estimated Useful Life 10 years    
Machinery, rental equipment, equipment, automobiles and furniture
      
Property, Plant and Equipment      
Total property, plant and equipment, gross 20,649,000 20,506,000  
Machinery, rental equipment, equipment, automobiles and furniture | Minimum
      
Property, Plant and Equipment      
Estimated Useful Life 2 years    
Machinery, rental equipment, equipment, automobiles and furniture | Maximum
      
Property, Plant and Equipment      
Estimated Useful Life 10 years    
Leasehold improvements
      
Property, Plant and Equipment      
Total property, plant and equipment, gross 9,708,000 9,696,000  
Estimated Useful Life 10 years    
Molds and tooling
      
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 4,933,000 $ 4,880,000  
Molds and tooling | Minimum
      
Property, Plant and Equipment      
Estimated Useful Life 2 years    
Molds and tooling | Maximum
      
Property, Plant and Equipment      
Estimated Useful Life 5 years