CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net (loss)	$ (2,437)	$ (6,851)
Adjustments to reconcile net loss to net cash (used) provided by operating activities:
Depreciation and amortization	5	8
Loss on disposal of assets	3
Deferred tax assets	80	263
Asset allowances and reserves	(196)	(166)
Changes in assets and liabilities:
Accounts receivable	1,476	(510)
Royalty receivable	60	36
Inventory	(356)	(2,326)
Prepaid purchases	(57)	390
Prepaid expenses and other current assets	76	997
Other assets	(3)	(50)
Accounts payable and other current liabilities	(258)	47
Deferred revenue	115	50
Income taxes payable	(698)	2,956
Net cash (used) by operating activities	(2,190)	(5,156)
Cash Flows From Investing Activities:
Proceeds from sale of short term investments	44,110	70,136
Purchases of short term investments	(56,481)	(61,058)
Additions to property, plant and equipment		(4)
Net cash (used) provided by investing activities	(12,371)	9,074
Cash Flows from Financing Activities:
Purchases of treasury stock	(2,618)	(6,293)
Net cash (used) by financing activities	(2,618)	(6,293)
Net (decrease) in cash and cash equivalents	(17,179)	(2,375)
Cash and cash equivalents at beginning of the period	25,096	27,471
Cash and cash equivalents at end of the period	7,917	25,096
Cash paid for:
Interest		4
Income taxes	$ 277	$ 320