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 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Property, Plant and Equipment          
Depreciation expense $ 400,000 $ 600,000 $ 1,400,000 $ 1,800,000  
Property, Plant and Equipment          
Total property, plant and equipment, gross 36,204,000   36,204,000   35,290,000
Less accumulated depreciation (33,109,000)   (33,109,000)   (31,747,000)
Total property, plant and equipment, net 3,095,000   3,095,000   3,543,000
Machinery, rental equipment, equipment, automobiles and furniture
         
Property, Plant and Equipment          
Total property, plant and equipment, gross 21,365,000   21,365,000   20,649,000
Leasehold improvements
         
Property, Plant and Equipment          
Total property, plant and equipment, gross 9,728,000   9,728,000   9,708,000
Molds and tooling
         
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 5,111,000   $ 5,111,000   $ 4,933,000