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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 29,182   $ 29,182   $ 29,334
Less, accumulated depreciation (26,351)   (26,351)   (26,475)
Total property, plant and equipment, net 2,831   2,831   2,859
Depreciation expense 200 $ 200 400 $ 400  
Machinery, rental equipment, equipment, automobiles and furniture          
Property, Plant and Equipment          
Total property, plant and equipment, gross 15,295   15,295   15,481
Leasehold improvements          
Property, Plant and Equipment          
Total property, plant and equipment, gross 11,053   11,053   10,949
Molds and tooling          
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 2,834   $ 2,834   $ 2,904