Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 1,467,000		$ 1,354,000
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	196,000		163,000
Depreciation and amortization	290,000		279,000
Unrealized loss on marketable securities	65,000
Equity in income of unconsolidated affiliate	(290,000)		(234,000)
Changes in assets and liabilities:
Accounts receivable, net	(241,000)		(299,000)
Accounts receivable, related party	(280,000)		(104,000)
Inventories	558,000		226,000
Prepaid expenses	(1,023,000)		841,000
Accounts payable and accrued liabilities	(610,000)		(549,000)
Net cash provided by operating activities	132,000		1,677,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(240,000)		(734,000)
Net cash used in investing activities	(240,000)		(734,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	120,000		61,000
Repurchase of common stock	(1,617,000)		(1,624,000)
Net cash used in financing activities	(1,497,000)		(1,563,000)
Decrease in cash	(1,605,000)		(620,000)
Cash, beginning of the period	8,763,000	[1]	9,456,000
Cash, end of the period	$ 7,158,000		$ 8,836,000

[1] The condensed consolidated balance sheet as of December 31, 2017 has been prepared using information from the audited consolidated balance sheet as of that date.