CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net (loss)	$ (1,445)	$ (1,932)
Adjustments to reconcile net loss to net cash (used) provided by operating activities:
Depreciation and amortization	4	4
Deferred tax assets	78	(24)
Asset allowances and reserves	(189)	(57)
Changes in assets and liabilities:
Accounts receivable	985	(513)
Royalty receivable	(50)	36
Due from affiliates	(8)
Inventory	(26)	(2,579)
Prepaid purchases	(855)	384
Prepaid expenses and other current assets	(106)	664
Other assets	(7)
Accounts payable and other current liabilities	(86)	225
Deferred revenue	(50)
Income taxes payable	(250)	1
Net cash (used) by operating activities	(2,005)	(3,791)
Cash Flows From Investing Activities:
Proceeds from sale of short term investments	16,079	24,903
Purchases of short term investments	(15,085)	(23,000)
Additions to property, plant and equipment		(4)
Proceeds from disposals of property, plant and equipment	1
Net cash provided by investing activities	995	1,899
Cash Flows from Financing Activities:
Purchases of treasury stock	(727)	(3,652)
Net cash (used) by financing activities	(727)	(3,652)
Net (decrease) in cash and cash equivalents	(1,737)	(5,544)
Cash and cash equivalents at beginning of the period	25,096	27,471
Cash and cash equivalents at end of the period	23,359	21,927
Cash paid for:
Interest		5
Income taxes	$ 253	$ 4