CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net (loss)	$ (1,863)	$ (1,445)
Adjustments to reconcile net loss to net cash (used) by operating activities:
Amortization of right-of-use assets	40
Depreciation and amortization	1	4
Deferred tax assets	6	78
Asset allowances and reserves	(37)	(189)
Changes in assets and liabilities:
Accounts receivable	(32)	985
Royalty receivable		(50)
Due from affiliates		(8)
Inventory	899	(26)
Prepaid purchases	2	(855)
Prepaid expenses and other current assets	(165)	(106)
Other assets	19	(7)
Accounts payable and other current liabilities	46	(86)
Deferred revenue	(110)	(50)
Income taxes payable	(196)	(250)
Net cash (used) by operating activities	(1,390)	(2,005)
Cash Flows From Investing Activities:
Proceeds from sale of short-term investments		16,079
Purchases of short-term investments	(1,443)	(15,085)
Disposals of property, plant and equipment		1
Net cash (used) provided by investing activities	(1,443)	995
Cash Flows from Financing Activities:
Purchases of treasury stock		(727)
Net cash (used) by financing activities		(727)
Net (decrease) in cash and cash equivalents	(2,833)	(1,737)
Cash and cash equivalents at beginning of the period	7,917	25,096
Cash and cash equivalents at end of the period	5,084	23,359
Cash paid for:
Income taxes	$ 199	$ 253