Property, Plant and Equipment - Tabular Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 32,059	$ 32,129
Less, accumulated depreciation	(24,310)	(26,838)
Total property, plant, equipment and rental assets, net	7,749	5,291
Machinery, equipment, automobiles and furniture
Property, Plant and Equipment
Total property, plant and equipment, gross	15,115	15,344
Leasehold improvements
Property, Plant and Equipment
Total property, plant and equipment, gross	7,857	11,074
Molds and tooling
Property, Plant and Equipment
Total property, plant and equipment, gross	3,101	2,893
Rental assets
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 5,986	$ 2,818