CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net (loss)	$ (850)	$ (890)
Adjustments to reconcile net loss to net cash (used) provided by operating activities:
Depreciation and amortization	2	2
Deferred tax assets	43	(21)
Asset allowances and reserves	(149)	(86)
Changes in assets and liabilities:
Accounts receivable	1,077	(208)
Royalty receivable		(62)
Inventory	(679)	(3,578)
Prepaid purchases	155	605
Prepaid expenses and other current assets	13	913
Other assets	(7)
Accounts payable and other current liabilities	70	310
Deferred revenue	(50)
Income taxes payable		1
Net cash (used) by operating activities	(375)	(3,014)
Cash Flows From Investing Activities:
Proceeds from sale of short term investments		24,998
Purchases of short term investments	(1,085)
Additions to property, plant and equipment		(4)
Disposals to property, plant and equipment	1
Net cash (used) provided by investing activities	(1,084)	24,994
Cash Flows from Financing Activities:
Purchases of treasury stock	(380)	(26)
Net cash (used) by financing activities	(380)	(26)
Net (decrease) increase in cash and cash equivalents	(1,839)	21,954
Cash and cash equivalents at beginning of the period	25,096	27,471
Cash and cash equivalents at end of the period	23,257	49,425
Cash paid for:
Interest		$ 3
Income taxes	$ 3