CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net (loss)	$ (987)	$ (850)
Adjustments to reconcile net loss to net cash (used) provided by operating activities:
Amortization of right-of-use assets	51
Depreciation and amortization		2
Deferred tax assets		43
Asset allowances and reserves	(51)	(149)
Changes in assets and liabilities:
Accounts receivable	(212)	1,077
Inventory	165	(679)
Prepaid purchases	402	155
Prepaid expenses and other current assets	68	13
Other assets		(7)
Accounts payable and other current liabilities	175	70
Due to affiliate	1
Deferred revenue	(55)	(50)
Income taxes payable	(1)
Net cash (used) by operating activities	(444)	(375)
Cash Flows From Investing Activities:
Purchases of short-term investments	(213)	(1,085)
Disposals of property, plant and equipment		1
Net cash (used) by investing activities	(213)	(1,084)
Cash Flows from Financing Activities:
Purchases of treasury stock		(380)
Net cash (used) by financing activities		(380)
Net (decrease) in cash and cash equivalents	(657)	(1,839)
Cash and cash equivalents at beginning of the period	7,917	25,096
Cash and cash equivalents at end of the period	7,260	23,257
Cash paid for:
Income taxes		3
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	65	0
Right-of-use assets obtained in exchange for new operating lease liabilities	650	0
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 5	$ 0