Business Segment Information - Reconciliation of Total Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment income (loss):
Total income from reportable segments	$ (2,351,000)	$ (1,396,000)	$ (3,922,000)	$ (2,988,000)
Amortization of intangible assets	(231,000)	(65,000)	(297,000)	(130,000)
Other income, net	117,000	18,000	107,000	33,000
Interest income, net	48,000	41,000	81,000	80,000
Loss from operations before income taxes	(2,186,000)	(1,337,000)	(3,734,000)	(2,875,000)
Operating segments
Segment income (loss):
Total income from reportable segments	3,030,000	2,659,000	5,893,000	4,708,000
Unallocated amounts
Segment income (loss):
Corporate and other expenses	(5,150,000)	(3,990,000)	(9,518,000)	(7,566,000)
Amortization of intangible assets	(231,000)	(65,000)	(297,000)	(130,000)
Other income, net	117,000	18,000	107,000	33,000
Interest income, net	48,000	41,000	81,000	80,000
Loss from operations before income taxes	$ (2,186,000)	$ (1,337,000)	$ (3,734,000)	$ (2,875,000)