Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 3,007,000		$ 2,457,000
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	312,000		244,000
Depreciation and amortization	430,000		426,000
Realized gain on sale of marketable securities	(3,000)
Unrealized loss on marketable securities	43,000
Equity in income of unconsolidated affiliate	(393,000)		(339,000)
Gain on sale of property			(385,000)
Changes in assets and liabilities:
Accounts receivable, net	(1,166,000)		(797,000)
Accounts receivable, related party	(134,000)		(276,000)
Inventories	897,000		1,530,000
Prepaid expenses	(834,000)		254,000
Accounts payable and accrued liabilities	(1,086,000)		(440,000)
Net cash provided by operating activities	1,073,000		2,674,000
Cash Flows From Investing Activities:
Purchase of property and equipment	(424,000)		(923,000)
Proceeds from sales of marketable securities	15,000
Proceeds from sale of property			537,000
Net cash used in investing activities	(409,000)		(386,000)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	224,000		125,000
Repurchase of common stock	(2,828,000)		(2,901,000)
Net cash used in financing activities	(2,604,000)		(2,776,000)
Decrease in cash	(1,940,000)		(488,000)
Cash, beginning of the period	8,763,000	[1]	9,456,000
Cash, end of the period	$ 6,823,000		$ 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.