Business Segment Information - Reconciliation of Total Segment (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Segment income (loss):
Total income from reportable segments	$ (1,571,000)	$ (1,592,000)
Amortization of intangible assets	(66,000)	(65,000)
Other income (expense), net	(10,000)	15,000
Interest income, net	33,000	39,000
Loss from operations before income taxes	(1,548,000)	(1,538,000)
Operating segments
Segment income (loss):
Total income from reportable segments	2,863,000	2,049,000
Unallocated amounts
Segment income (loss):
Corporate and other expenses	(4,368,000)	(3,576,000)
Amortization of intangible assets	(66,000)	(65,000)
Other income (expense), net	(10,000)	15,000
Interest income, net	33,000	39,000
Loss from operations before income taxes	$ (1,548,000)	$ (1,538,000)