Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Property, Plant and Equipment      
Depreciation expense $ 1,300 $ 1,200 $ 1,800
Total property, plant and equipment, gross 31,695 34,355  
Less accumulated depreciation (28,158) (30,832)  
Total property, plant and equipment, net $ 3,537 3,523  
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 $ 19,016 20,873  
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 $ 9,855 9,760  
Estimated Useful Life 10 years    
Molds and tooling      
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 2,824 $ 3,722  
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