Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 2,228,000		$ 1,467,000
Adjustments to reconcile net income to net cash used in operating activities:
Stock-based compensation	260,000		196,000
Depreciation and amortization	267,000		290,000
Gain (loss) on marketable securities	(609,000)		65,000
Equity in income of unconsolidated affiliate	(361,000)		(290,000)
Operating lease expense, net of accretion	366,000
Changes in assets and liabilities:
Accounts receivable, net	(250,000)		(241,000)
Accounts receivable, related party	(454,000)		(280,000)
Inventories	(991,000)		558,000
Prepaid expenses	589,000		(1,023,000)
Accounts payable and accrued liabilities	(525,000)		(610,000)
Lease liabilities	(327,000)
Net cash provided by operating activities	193,000		132,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(254,000)		(240,000)
Proceeds from sales of marketable securities	133,000
Net cash used in investing activities	(121,000)		(240,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	59,000		120,000
Repurchase of common stock	(1,636,000)		(1,617,000)
Net cash used in financing activities	(1,577,000)		(1,497,000)
Decrease in cash	(1,505,000)		(1,605,000)
Cash, beginning of the period	7,007,000	[1]	8,763,000
Cash, end of the period	$ 5,502,000		$ 7,158,000

[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.