CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net (loss)	$ (4,307)	$ (2,437)
Adjustments to reconcile net loss to net cash (used) by operating activities:
Amortization of right-of-use assets	33
Depreciation and amortization	2	5
Deferred tax assets	448	80
Asset allowances and reserves	3	(196)
Changes in assets and liabilities:
Accounts receivable	117	1,476
Inventory	1,602	(356)
Prepaid purchases	167	(57)
Prepaid expenses and other current assets	97	136
Other assets	60	(3)
Accounts payable and other current liabilities	47	(258)
Income taxes payable	(195)	(698)
Deferred revenue	15	115
Net cash (used) by operating activities	(1,911)	(2,193)
Cash Flows From Investing Activities:
Proceeds from sale of short-term investments	1,850	44,110
Purchases of short-term investments	(1,580)	(56,481)
Disposals of property, plant and equipment		3
Net cash provided (used) by investing activities	270	(12,368)
Cash Flows from Financing Activities:
Purchases of treasury stock		(2,618)
Net cash (used) by financing activities		(2,618)
Net (decrease) in cash and cash equivalents	(1,641)	(17,179)
Cash and cash equivalents at beginning of the year	7,917	25,096
Cash and cash equivalents at end of the year	6,276	7,917
Cash paid for:
Income taxes	$ 199	$ 277