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
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 28,966   $ 29,334
Less, accumulated depreciation (26,178)   (26,475)
Total property, plant and equipment, net 2,788   2,859
Depreciation expense 200 $ 200  
Machinery, rental equipment, equipment, automobiles and furniture      
Property, Plant and Equipment      
Total property, plant and equipment, gross 15,115   15,481
Leasehold improvements      
Property, Plant and Equipment      
Total property, plant and equipment, gross 11,017   10,949
Molds and tooling      
Property, Plant and Equipment      
Total property, plant and equipment, gross $ 2,834   $ 2,904