Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Property, Plant and Equipment          
Depreciation expense $ 300 $ 300 $ 600 $ 600  
Total property, plant and equipment, gross 31,364   31,364   $ 31,695
Less accumulated depreciation (28,568)   (28,568)   (28,158)
Total property, plant and equipment, net 2,796   2,796   3,537
Machinery, rental equipment, equipment, automobiles and furniture          
Property, Plant and Equipment          
Total property, plant and equipment, gross 18,662   18,662   19,016
Leasehold improvements          
Property, Plant and Equipment          
Total property, plant and equipment, gross 9,855   9,855   9,855
Molds and tooling          
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 2,847   $ 2,847   $ 2,824